I've seen a reasonable amoutn of him down here in ACC country, and i'm impressed by what i saw. (I'm of the mind we can't go wrong with fairley/dareus/bowers/miller at #3) The guy's got the continuous hustle to go after plays, and often times blows things up in the backfield.
I can't answer why the sack totals jump, but this year at Clemson, he recorded a sack in 11 of their 13 games. So its not like he piled up all his sacks against garbage opponents. One thing to consider is that these guys are young, and there are times that guys don't blossom until later on in their collegiate career when "the light goes on." Rarely do players dominate for all 3 years at the collegiate level. Even fairley didn't do much in 2009.
Bowers is also listed at 280, so if he's anywhere around that, it's big enough to play 3-4 end.