I do think that the D has some young talent. They are just missing a few pieces and the pieces they do have are inexperienced for the most part. Just going over the positions:
DE: Scott should not be a starter at this level. He'll make some plays, but disappears at times and gets worn down. Not his fault, he should be more of a situational player. Morrissey has shown flashes. He's gaining good experience and will be better next year. Meyer has really good potential and we've seen him make plays here and there. Just needs another year. Kron has shown the ability to be a decent backup. Lemke has disappointed so far. I thought that he would be a Rony Nelson type pass rusher for us, but he really has yet to make a play in his ISU career. No idea how Waggoner looks in practice. Also not sure if Mattison and/or Meeks ends up here next year.
DT/NG: I think that we've seen that Irving and Coe have potential. We have to remember that they're only 6 games in to playing DT for the first time ever. I believe that with another 10 lbs, Irving may be an NFL player. Jensen IMO is not a B12 starter. He should be a rotation guy. They need a brute like Clinkscales in there (which is looking less and less likely). A big ol' run stuffing NG would change this defense immensely. I think that Aka and Cousins have a bright future in front of them, but it's a lot to ask of a RSFR to play this early on the DL. They're going to be solid rotation guys next year I have no doubt. We've heard good things about Trent, not as much about Garcia, but those two at the very least mean that there are bodies in the pipeline.
LB: We'll miss George some. He's not Klein and Knott, but he's a solid player if there's talent around him. Brackens and Knott are in their first years playing LB and both need to put on some muscle. But I think both can be solid players at least. Next year we'll probably see Keeley step in at MIKE and with the improvement of the other two spots, I think overall the position will be better. Still pretty far from being deep, but at least they will be counting on RSFR for depth and not starters. Mills I think could be a good NB. Not sure where Mattison and Meeks fit. White should be a good second stringer at least although he could very easily push Seeley. It will be interesting to see where Webster fits in.
CB: I believe that the reason Tribune is playing is that they are planning on him starting next year opposite Richardson. They'll miss Watson, but he's dinged more than any CB I can remember. I've been disappointed with Lynn...thought he would be right in there playing more. They have a nice group of TRFR in that should provide some depth.
S: I agree with others that Charlie Rogers is going to start here. I think that the other spot is up for grabs. If they can sign McDaniel, he'll probably start. If not, it could be Cotton or Cotton-Moya. To me, Mutcherson and Schaeffer are depth players.
To me, they need to get some JUCOs to up the depth and competition, but just the natural progression of the younger players they have should make this D better by leaps and bounds. I'd go JUCO at DE, NG, WLB, CB, S.
DE: Morrissey, JUCO, Lemke
DT: Irving, Coe, Aka, Trent
NG: Jensen/JUCO, Cousins, Garcia
DE: Meyers, Kron, Meeks
SAM: Brackens, Mills
MIKE: Seeley/White
WILL: Knott, Webster
CB: Tribune, Lynn
FS: Rogers, Mutcherson/Schaeffer
SS: Cotton-Moya/McDaniel?, Cotton
CB: Richardson, Ruth/JUCO