From what I saw of this defense, I thought there were two major coaching errors. One was the desire to do too many things as has been discussed in this thread. The second is a desire to play too many guys. Donofrio seems to be hellbent on being multiple defensively which is fine by me. However, I do consider it fairly mandatory to be good at *something.* Whether that's Stoops' spin zone or Saban's cover 1 or Shannon's 2 deep man or quarters or whatever you want, you need *something* that you can apply week to week and rely upon as a base. If you don't have that, you have nothing and offenses will spin you out of control while you call more and more crap. Donofrio didn't have that last year--I guess the closest thing to it seemed to be cover 3 which was painfully stoic and bland because guys weren't that good at it. Had they really focused on this as their primary defense, they probably would've gotten better at reading route combinations and squeezing lanes making it harder on the offense through repetition. Regarding the latter issue, it's fairly inexplicable why every game featured mass substitutions **** near all the time, and it likely stunted the growth of some young guys that could've used the reps but instead were watching the Cornelius and Highsmith's and Telemaque's of the world toil around. I understand the idea of subbing in for tired players, but that is not what we did. We subbed massively even in the first couple drives of the game, indicating that we were subbing because we WANTED to and not because we NEEDED to. There's not a great rationale for that IMO.
This is not to say that we should've had some top 20 defense absent the coaching--talent was the biggest problem. But, I would've liked to have seen some improvement such that by the end of the year teams like Duke weren't scoring 50 on our defense. As we move to this year, it's the same old thing. I think that it's an error to try to apply more and more and more things because the guys are "experienced" because they still haven't proven to be good at anything. Last I saw it our defense sucked, so I can't figure how we can start doing a bunch more things. I would also hope that they shorten the rotation. Guys like Perryman and Bush and their #1 corner and Pierre don't need to come off the field every 2 downs just because it looks pretty.