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Because of the relatively cooler weather HR/Fly tends to be a hair lower in the spring months...I'm guessing the AL average at this very moment is in the neighborhood of 10%, not 11%. But I'm going on historical normals for that statistic.
As for Olson learning...you do have a good point about his offspeed game improving. I think, however, that until he rides a little higher for his arm slot, his breaking ball is always going to be more slurvey and lateral than biting, which limits the damage he can do with it.
He's definitely improving his command compared to 2007 though...so that's a positive sign.