I may get raked over the coals for this. For the record, I called defenses for 14 years at the college level. 11 of which were 4 down. 3 of which were 3 down. Whether the Griz were 3 or 4 down in the game is, in my not so professional opinion, couldn’t be more irrelevant.
Couple generic notes: Playing a 5-0-5 (3 down front) vs a 3 or 4 man surface is silly without a tight overhang/rush. I haven’t watched enough film to know how often the grizzlies do that, or if they ever do.
Usually in 3 down (unless you are a tight front team, which the grizzlies are not) you rush a 4th to get to some type of 4 man push anyway, whether it be over, under, even, TE based, RB based etc.
The calls for 4-3 or 3-4 are silly vs 11 personnel, again in my not so professional opinion. Vs. 12 personnel or heavier sets, they are valid, but I would still disagree because you are in trouble when matched up vs slot sets.
I’m not saying game plans don’t contribute giving up points, but to me the front/structure stuff are fallacies. Execution, players not plays, and play calling in that order — are the reason teams give up points on defense, and in that order!!