Every pitcher is an injury risk. At least when guys come back from TJ, they have a new UCL, which is the one thing we fear the most about every pitcher. Not everyone is the same after surgery, however.
The Biebs FB velo was declining for a couple of years before he blew out his elbow, but he generally has great secondaries and command. Sometimes command is the last thing to come back though, so that's something to keep an eye on. The reports on his recent outings have been very encouraging. If he's right, he's in our top 3 and starting a playoff game.
Definitely a gamble, and I hate to give up Stephen but we knew we'd be giving up good prospects at this deadline. Would be great if we can resign Bieber to a multi-year deal if he pitches well.