Playbooks

The Bear set inside the 46 formation is a defensive package, not an offensive one, and that distinction matters because the 46 family already sells pressure before the snap. Bear takes the base 4-3 personnel group and crowds the interior: a nose tackle over the center (NT), both defensive tackles shaded on the guards (RDT), and the ends (RLE, RRE) pinched tight off the tackles' inside shoulder. Compared to other 46 sets that spread the front and drop a linebacker into a flat zone, Bear eliminates every interior run gap at the snap. Guards get no free pull, centers cannot climb to the second level, and the A gaps are effectively closed without asking a linebacker to fill.
What separates Bear from the rest of the formation is how it forces the offense to declare early. Against 46 Mid Blitz and Engage Eight the front becomes an eight-man pressure look where the offense must either check to max protect or accept a free runner. Against Cover 3, Cover 1, and Safety Fire the same tight alignment disguises the coverage shell, so the quarterback cannot read the front and assume man or zone. LB Blitz 3 and Gap Press let you attack a specific gap without rotating the safeties, keeping the deep third intact behind the blitz.
The matchup advantage comes from the personnel imbalance Bear creates on the edges. With five bodies condensed inside, offenses running 11 or 12 personnel leave their tight end and slot receiver isolated against a linebacker or a rotating safety with no interior help available. Slant Weak and Slant Weak 3 slide the entire front toward the weak side, which is devastating against offenses that run away from strength or use a weak side lead block. If the offense responds with empty or spread sets, Bear becomes a liability, but against any formation with a fullback, a tight end, or a two back backfield, you are dictating terms.
Deploy Bear on second and short or third and one when the offense is in heavy personnel, since closing every interior gap forces a low percentage edge run or a throw into a disguised shell
Check the offensive personnel before the snap: if you see three or more receivers or an empty backfield, audible out of Bear entirely rather than accepting a linebacker on a slot matchup
Pair Engage Eight with a user controlled safety playing centerfield, and manually drop a defensive end using a coverage hot route if the offense checks to max protect, giving you a spot dropper against quick outs
Use Slant Weak against offenses that consistently run away from the tight end, then flip to Gap Press once they adjust so the pressure side changes without changing your coverage shell
Mix Cover 3 and Cover 1 out of the identical Bear alignment on consecutive plays to punish quarterbacks who read the front instead of the safety rotation, and use pinch or spread pre snap adjustments to fine tune the edge without abandoning interior leverage