I largely agree with your ratings, though would bump up OL to Big XII Championship level and bump down punter. The OL returns three great guys at the center and tackles and adds an all-ACC guy as a guard. One guard spot is up in the air but the competition for that position is talented and with the other four spots being pretty trustworthy I like our odds there. As for why I would drop punter, is just that we haven't seen any reason to believe he'll improve to that level yet. Even Dickson took a fair bit of time to figure it out and it's entirely possibly he busts. I think he'll get it together soon enough, but we shouldn't take it for granted.
I'd also bump up DL two levels. Roach back in position, Taquon opposite, and Wilbon in the center will be salty. Couple that with some really solid backups in Coburn and Ojomo and I think this will be one of our better units. I'd also knock TE down a level. We have no reason to assume we have a good blocking TE and while Brewer is decent at catching passes, we don't get nearly the same wrinkles out of the offense if he isn't a really good blocker too. And considering how much receiving talent we have, I'm not sure how useful having him on vs an extra WR that could motion into the backfield/an extra RB that could motion into the slot would be.