I heard he was throwing in 93mph in his junior year in HS and his fastball dropped in senior year to 89~91mph range.  I see he's doing really great in minor leagues.  Did he regain his fastball velocity?

By the way, I hear this is the reason why that he lost velocity during his senior year:

"O'Sullivan's stock slipped considerably as his velocity fell this year, but the Angels had a history with O'Sullivan as he had played on their scout league team in the fall. At the time, his fastball was clocked at 93 mph, but it fell off to the high 80s this spring amid concerns that O'Sullivan had bulked up in his upper half while using controversial Tom House as a pitching coach."

http://www.baseballamerica.com/today/2005draft/draftdayblog.html

Bad lesson costed his velocity (FYI, House coached Prior, Hamels and is now a pitching coach for USC Trojans).  For the sake of this guy, I hope he got a better lesson with minor league coaches