I don't think the OL can be great, that's not really their athletic ceiling. But I think they should be pretty good/solid. With top notch coaching, play calling and game planning that would be enough with our skill positions to be a damn fine offense that is a handful for anyone. The issue is going to be that stuff, not the quality of the OL IMO. Our inability to maximize what we have to work with will be where we fail offensively. I don't trust Gus or his hires to get that part done. I've seen no evidence that he can make that happen. I expect to see a lot of the same junk we've been seeing for 4 years or so now.
On defense the LB's terrify me. Experience matters there and I had just gotten used to seeing decent LB play again from Auburn after nearly a decade of complete crap at that position. If we aren't ready we'll get 4-5 games on repeat of last years MSU disaster. Teams will exploit our inability to be sound, read correctly and fill gaps. To me that's one of the most frustrating ways to suck because there is no way you win games when teams are gashing you for 7-9 yards a pop in the run game. It's game over and you know it from the 1st quarter on.