4-3 Shell Recruiting Guide (CFB 27): Who to Recruit and Why
4-3 Shell is a two-high match defense. It lives in even, four-down fronts on 84% of its snaps.
The snap counts put two interior linemen, two edges, two sub linebackers, and five defensive backs on the field at starter share. Sub packages are the base defense here.
The strip below shows every formation the book calls, grouped the way the play-call screen groups them. Tap any bubble for the recruiting answer at that spot, then use the board for the full read.
The formations, grouped like the play-call screen
Tap a bubble for the recruiting answer at that spot. Snap shares under each formation are that call's slice of the book.
Under 5% of this book's snaps. It lives in the appendix line.
Under 5% of this book's snaps. It lives in the appendix line.
The sign plan
Counts cover positions at 5% of the book's snaps or more. Bodies per snap decides how many each group needs. Each card jumps to its group on the board.
The board, by position group
Edges Sign 4: 2 starter, 2 rotation Speed Rusher 4 spots
RLE1Edge 65.0%Starter Speed Rusher AccelerationFinesse MovesPower MovesBlock Shedding
Designated pass rushers in the sub-package fronts. The pair aligns outside in Nickel and Dime spacing and wins with get-off, because a four-man rush has to create pressure while everyone else covers. Contain duty against scrambling quarterbacks comes with the job.
Physical 6'2 to 6'5, 245 to 270. Get-off outranks everything else.
RRE1Edge 65.0%Starter Speed Rusher AccelerationFinesse MovesPower MovesBlock Shedding
Designated pass rushers in the sub-package fronts. The pair aligns outside in Nickel and Dime spacing and wins with get-off, because a four-man rush has to create pressure while everyone else covers. Contain duty against scrambling quarterbacks comes with the job.
Physical 6'2 to 6'5, 245 to 270. Get-off outranks everything else.
LEDGE1Edge 33.5%Rotation Speed Rusher Finesse MovesPower MovesAccelerationBlock Shedding
First job is winning the edge as a rusher. Aligned wide in 4-down spacing, he attacks upfield at the snap and turns speed into pressure. He sets the edge on the way to the quarterback, not instead of it.
Physical 6'3 to 6'5, 240 to 265. First step over mass.
REDGE1Edge 33.5%Rotation Speed Rusher Finesse MovesPower MovesAccelerationBlock Shedding
First job is winning the edge as a rusher. Aligned wide in 4-down spacing, he attacks upfield at the snap and turns speed into pressure. He sets the edge on the way to the quarterback, not instead of it.
Physical 6'3 to 6'5, 240 to 265. First step over mass.
Corners Sign 4: 3 starter, 1 rotation Zone 4 spots
CB1Corner 95.4%Starter Zonealt: Field Corner Zone CoverageMan Coverage
Matches #1 from a zone start. He plays with zone eyes until the route distribution declares, then locks the vertical like man. Route recognition beats raw speed at this spot, which widens the recruiting pool. He midpoints #1 and #2 until the picture resolves, and the extra grass punishes slow processing more than slow legs.
Physical 5'11 to 6'2, 185 to 200. Recognition outranks timed speed.
CB1/CB2 are the outside pair; boundary vs field is alignment, the depth chart does not split them
CB2Corner 92.4%Starter Zonealt: Field Corner Zone CoverageMan Coverage
Matches #1 from a zone start. He plays with zone eyes until the route distribution declares, then locks the vertical like man. Route recognition beats raw speed at this spot, which widens the recruiting pool. He midpoints #1 and #2 until the picture resolves, and the extra grass punishes slow processing more than slow legs.
Physical 5'11 to 6'2, 185 to 200. Recognition outranks timed speed.
CB1/CB2 are the outside pair; boundary vs field is alignment, the depth chart does not split them
CB3Corner 65.0%Starter Zone Zone CoverageAwareness
Handles #2 in the match count. Seams and out-breakers from the slot are his to carry or pass off, and the pass-off decision is the skill. He funnels vertical stems to safety help and squeezes everything else.
Physical 5'9 to 6'0, 185 to 200. Processing outranks length.
first slot body; CB_slot rows cover CB3 and CB4
CB4Corner 25.9%Rotation Zone Zone CoverageAwareness
Handles #2 in the match count. Seams and out-breakers from the slot are his to carry or pass off, and the pass-off decision is the skill. He funnels vertical stems to safety help and squeezes everything else.
Physical 5'9 to 6'0, 185 to 200. Processing outranks length.
second slot body, on the field in dime sets
Interior DL Sign 4: 2 starter, 2 package Speed Rusher, Gap Specialist 4 spots
DT1Interior DL 98.5%Starter Speed Rusheralt: Power Rusher Finesse MovesPower MovesAccelerationBlock Shedding
Penetrates as the 3-technique. He lines up on the guard's outside shoulder and wins the B-gap with his first step, turning run downs into losses behind the line. On passing downs he supplies the interior rush that keeps quarterbacks off their spot. 24% of his snaps come from mugged formations. Protections point extra attention at the mugged threats, which leaves the nose and tackle in more one-on-one blocks they are expected to win.
Physical 6'2 to 6'5, 285 to 310. First-step quickness outranks bulk.
NT1Interior DL 89.3%Starter Gap Specialistalt: Pure Power Block SheddingStrength
Anchors the front as the shade nose. He controls the A-gap against interior runs and holds his ground against double teams so the MIKE can flow. Pocket push on late downs is a bonus on top of the run-down anchor. 27% of his snaps come from mugged formations. Protections point extra attention at the mugged threats, which leaves the nose and tackle in more one-on-one blocks they are expected to win.
Physical 6'1 to 6'4, 300 to 330. Anchor strength outranks height.
DT2Interior DL 6.1%Package Gap Specialist Block SheddingStrength
Covers the guards in bear looks and multiplies in goal line fronts, where DT3 and RDT tokens add extra interior bodies. Every rep is a single block in a phone booth, so he has to win fast with power because there is no space to recover.
Physical 6'2 to 6'5, 300 to 330. Short-area power outranks any testing number.
DT3Interior DL 6.1%Package Gap Specialist Block SheddingStrength
Covers the guards in bear looks and multiplies in goal line fronts, where DT3 and RDT tokens add extra interior bodies. Every rep is a single block in a phone booth, so he has to win fast with power because there is no space to recover.
Physical 6'2 to 6'5, 300 to 330. Short-area power outranks any testing number.
Safeties Sign 2: 2 starter Coverage Specialist 2 spots
FS1Safety 98.5%Starter Coverage Specialist Zone CoverageAwarenessTackle
Reads #2 from depth on his half. Match rules make him a two-way player: vertical by #2 is his to carry, anything under it frees him to rob or fit. Once his key blocks, he arrives in the run fit like an extra backer.
Physical 6'0 to 6'2, 195 to 210. Read speed outranks range.
SS1Safety 98.5%Starter Coverage Specialistalt: Hybrid Zone CoverageAwarenessTackle
Mirrors the FS job to his side. Match shells make the safeties interchangeable readers, so both need the same eyes and the same trigger. Whichever one offenses find slower becomes the target, which sets the floor for both spots.
Physical 6'0 to 6'2, 195 to 210. Read speed outranks range.
Sub LBs Sign 2: 2 starter Lurker 2 spots
SUBLB1Sub LB 69.5%Starter Lurker Man CoverageZone CoverageAccelerationHit Power
Holds the second level of the sub packages that carry most snaps. The job is coverage first, matching backs and tight ends underneath, with a late rush added when the assignment stays in to block. Sub fronts field both SUBLB tokens together, so this is a sign-two position. Coverage demand runs highest here: nearly three quarters of shell-match snaps are sub personnel. 34% of his snaps come from mugged formations. Walked into an A-gap before the snap, he either arrives with the rush or bails into coverage after showing it, and the bail is the hard part. Short-area burst plus coverage recovery is the trait pair that survives the assignment.
Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.
No blitz attribute exists on the scouting panel. Blitz maps to Acceleration and Hit Power here.
SUBLB2Sub LB 52.8%Starter Lurker Man CoverageZone CoverageAccelerationHit Power
Holds the second level of the sub packages that carry most snaps. The job is coverage first, matching backs and tight ends underneath, with a late rush added when the assignment stays in to block. Sub fronts field both SUBLB tokens together, so this is a sign-two position. Coverage demand runs highest here: nearly three quarters of shell-match snaps are sub personnel. 34% of his snaps come from mugged formations. Walked into an A-gap before the snap, he either arrives with the rush or bails into coverage after showing it, and the bail is the hard part. Short-area burst plus coverage recovery is the trait pair that survives the assignment.
Physical 6'0 to 6'3, 220 to 240. Coverage movement outranks bulk.
No blitz attribute exists on the scouting panel. Blitz maps to Acceleration and Hit Power here.
Off-ball LBs Sign 3: 3 rotation Signal Caller 3 spots
MIKE1Off-ball LB 28.9%Rotation Signal Calleralt: Thumper Man CoverageZone CoverageTacklePlay RecognitionAwareness
79% of snaps ask for the even_4down MIKE job, 21% ask for the bear_heavy MIKE job. Runs the middle of the base defense. He triggers downhill between the tackles against the run and drops to the hook zones on pass downs. Hits lead blockers behind a loaded line. The front eats the linemen and he meets fullbacks and pullers in the hole, keeping his fits square in short yardage. Coverage asks are minimal here. When it stays on the field the backers become the underneath matchers, taking final #3 and holding the middle hook against layered routes.
Physical 6'0 to 6'3, 230 to 250. Instincts outrank straight-line speed.
Archetype Signal Caller (alt: Thumper)
Physical 6'0 to 6'3, 230 to 250. Instincts outrank straight-line speed.
Attributes to scout TacklePlay RecognitionAwarenessZone Coverage
Archetype Thumper
Physical 6'0 to 6'3, 240 to 260. Thump outranks range.
Attributes to scout TackleHit Power
WILL1Off-ball LB 28.9%Rotation Signal Calleralt: Lurker Man CoverageZone CoverageSpeedPursuit
79% of snaps ask for the even_4down WILL job, 21% ask for the bear_heavy WILL job. Chases from the weak side. Protected from most direct blocks, he flows fast to the ball and cleans up what the front spills. In coverage he carries backs to the flat and closes on checkdowns. Fits downhill from the weak side of heavy fronts. He fills fast and takes on climb blocks without giving ground to finish runs at the line. Backside screens are the only pass work that finds him. When it stays on the field the backers become the underneath matchers, taking final #3 and holding the middle hook against layered routes.
Physical 6'0 to 6'2, 225 to 240. Closing speed outranks size.
Archetype Signal Caller (alt: Lurker)
Physical 6'0 to 6'2, 225 to 240. Closing speed outranks size.
Attributes to scout SpeedPursuit
Archetype Thumper
Physical 6'0 to 6'3, 235 to 255. Thump outranks range.
Attributes to scout TackleHit Power
SAM1Off-ball LB 22.8%Rotation Signal Caller Man CoverageZone CoverageHit PowerStrengthTackle
Plays the strong side over tight ends. He sets the edge against the run when the play comes at him and walls the tight end in coverage when it does not. Most of his snaps in this cluster come from the 4-3 family, so he lives near the line and in traffic. When it stays on the field the backers become the underneath matchers, taking final #3 and holding the middle hook against layered routes.
Physical 6'2 to 6'4, 235 to 255. Play strength at the point outranks range.
Open a row for the full job and the notes behind it. The text is on the page either way, so find-in-page still works.
Below the cutoff
SS2, 9 snaps (4.57%), ignore tier per schema thresholds.
RDT1, 6 snaps (3.05%), ignore tier per schema thresholds.
Prevent 3 Deep: 3 plays could not be mapped to a formation, so they sit outside the counts.
Built from 194 charted plays of 197 in the book. The football is verified against named coaching sources, and the attribute targets are verified against the in-game scouting screens.
Keep reading
See where 4-3 Shell ranks for the concepts you actually call in the CFB 27 Playbook Finder.
Coverage chalk talk that matches this style: how to run Quarters, how to run Palms and every match coverage term.