I agree, but sometimes the freshman comes in with the size, talent and mental capacity to handle the rigors of SEC play. Plus, it's not like the whole line is full of upperclassmen. In our case, at RG, I don't think anything is settled. Jack Jones just wasn't big enough yet and needed some time in the S&C program....maybe 2 full years.
Weisman's ceiling is probably an average SEC OG and no more. I still think he looks lost a lot of times, when pulling. In contrast, when you see Coleman Thomas pulling, he's determined to plant some defender's backside into the turf.
I think Mosley should be the RG, hands down. He has extremely rare size and it is mostly good weight...but who knows why he hasn't yet cracked the starting lineup? Maybe his conditioning isn't where it needs to be. That leaves Boulware, as his main competition, IMHO. He's also talented, and big enough to challenge Hall at RT.