My biggest thing with Donofrio isnt the overall concept, its the execution. For a DC you can give anybody Nick's, 49ers, Seahawks, etc playbook but if there are 3-4 WR on the field and you stay in base 4-3 defense with LB trying to cover slot WR, well lord help us, I dont think anybody can do anything for you.
I saw too much of that, some teams whenever they need to move the ball would just smoothly spread the field run a cross or seam from slot and pick up yards in chunks, Kstate comes to mind which still gives me nightmares