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Blanton and Wolf have much better offspeed stuff than Fister, although I can't speak on Bosio or Suppan (never really focused on those guys when they pitched).
Ah.. ya, If he can limit BBs without the HR rate getting out of control I think he'd be a close to league-average starter. Personally I still have a hard time visualizing it though.. Hes going to have to nibble, and that'll make it difficult to maintain the miniscule BB rate.
IF he can consistently get strike 1,2 on the black than that bodes well for him developing into a #4-6 SP type. It is really a consistency thing though, so we need several starts before we can start getting an idea of what we have here.