It doesn't matter if it's a "tough" lefty or not. Regardless of the skills of the pitcher, if he throws with his left hand, he will get Granderson out. That includes all-star starters like the ones you mentioned, 5th starters, closers, and journeymen relievers. I'm sure a few of the more skilled left-handed peanut guys at Wrigley would probably get him out. HE IS A PLATOON PLAYER!!! Learn it, love it. is he a platoon player if he's by far our best defensive option in cf? I'm pretty sure a Reed Johnson (or somebody worse) would hit enough to make up the difference on defense.