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A platoon split doesn't bother me. A repertoire that turns your generic Double-A or Triple-A lefty into a league average hitter agianst him does, because I worry what that means about quality major league lefties (of which he's really only faced one so far, maybe 2-3 depending on your opinions of Moreland and Gordon).
Obviously if lefties only OPS in the mid-.600's against him all year, I'll start singing a different tune. To smile condescendingly and pretend that 3 starts has conclusively proven or disproven anything, though, is absurd.