I saw the D swarm to the ball. 4 ... 5... 6 guys, hustling.
There were very few missed tackles or missed assignments and when they swarm, one mistake won't kill you anyway because another guy is there ... and another.
Do all that and you get a D that doesn't need a complex scheme. No Rex, no Rob
Last year = 493 yards and 28 first downs.
I'll take simple, football hustle over trickeration, any day.