Garza actually has a 4 pitch repetoire, he just doesn't use his offspeed pitches enough right now. That will adjust with time. Now I don't think Garza can truelly dominates like Cain, Bonderman, Liriano... But I think he can make an adequate #2 guy with good k numbers.
I could be biased here because I never liked Tulo all that much. If it were say Stephen Drew, I'll take Drew without even blinking.
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