Playbooks

Cub is the heavy front sub-package inside the 3-4, and it is a defensive set, not an offensive one. Instead of the standard two-tackle-plus-nose alignment you get from base 3-4 sets, Cub drops into a Base 5-2 personnel look with a true nose tackle flanked by a right left end and right right end, and only two true linebackers behind the line. That extra big body on the line is the entire point: you are trading a linebacker's coverage range for a fifth hand-in-the-dirt defender who occupies a gap on every snap rather than reading and reacting to it.
The alignment matters most against gap-scheme and downhill run games. With NT, RLE, and RRE all tagged, Cub gives you defenders sitting in the A and B gaps pre-snap, which kills the double-team-and-climb combos offenses use to get to your second level. Because the ends are aligned wider and heavier than in standard 3-4 sets, tackle-around and toss concepts get forced back inside into the traffic you just created. The two remaining linebackers stay clean and can flow sideline to sideline without fighting through wash.
The play list splits cleanly into pressure and coverage. Gap Press, Olb Blitz, and Sting Pinch are your run-down and short-yardage calls, with Sting Pinch collapsing interior gaps and Olb Blitz bringing edge heat off the outside linebacker. Trio Sky Zone, Cover 1 Hole, Cover 3 Sky, Cover 4 Quarters, and Strike Spy 2 give you the full coverage menu behind the same front, so you can show a run-stuffing shell and still drop eight into Quarters on a play-action rollout attempt. Strike Spy 2 is the specific answer to scrambling quarterbacks who have been punishing your five-man rush.
Call Cub on second and short, third and one, and goal line situations where the offense is committed to running behind a gap scheme
User the hook linebacker on every zone call out of this set, because the AI drops are too slow to cover the middle window on their own
Alternate Sting Pinch and Gap Press on consecutive run downs so the offense cannot key your line slant direction from the pre-snap alignment
Check to Cover 4 Quarters when you see empty or trips, since Cub cannot match personnel and you need the extra deep help against verticals
Save Strike Spy 2 for scrambling quarterbacks on third and long, and manually contain the backside end to seal the rollout lane