He's not going to magically climb ahead of Long. Pitt finished with 5 wins, there are no bowl games for them. You don't climb up draft boards if you're not playing, not offensive lineman. I'd be thoroughly and utterly shocked if Otah is picked ahead of Long, let alone in the top 10, that of course depending on which teams end up where. OT/OG has a lot less to do with potential and upside than any of the skilled positions. Either you can block, or you can't.
I don't know how you say Long has been slipping. He's the best offensive linemen in the NCAA, no doubt about it. How doesn't he have much upside? You don't get picked as a top 5 guy unless you can do something and do it really effing good. Long is the best linemen in the draft, no doubt about it. Big Ten Linemen of the Year back to back seasons and only surrendered 1 sack.
I've seen most of Michigan's games living up there at school, and the guy is the real deal. You don't get past him.