I agree even at his age I don’t want Cam 2 gapping. A wrinkle of the 3-4 under is that yes it’s a 1 gap scheme but at least 1 player has to 2 gap.
Generally that’s the 5 tech.
In some of those schemes the Sam is actually the primary rusher. The Will LB is a rusher/ dropper and then the Mike and Mo are the two ILBs
FWIW Roman Harper said it in 2016 that Allen’s defense is more 3-4 than 4-3 and to a degree you saw a lot of standup rushers the last two years so we arent diverging much