fwiw, from the UCF board it sounds like a starting DT (Hill) is at least considering a transfer. From what I gather he was a true soph this year so would be able to redshirt next. http://ucfknights.com/roster.aspx?rp_id=5525
Vincent Valentine was not known as the most self-motivated guy in the world, and he's playing on Sundays. It may be he's not had the best coaching experiences, and it has left him a little jaded. A change of atmosphere can work wonders for someone's motivation.
I know nothing about this guy, but I think the idea that someone is "uncoachable" is dubious.
I wouldn't let it be a deciding factor, the guy has massive talent. There was just some information out there that at one of the camps he was not as responsive and willing to accept coaching as preferred.