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That'd be my question, too, CA.
The offspeed question is a non-starter, but Ackley's attack is indeed geared to the inner half of the plate, as the TL.com charts also confirm.
He can deal with stuff on the black, but am not sure how often he drives it. That'd be the last remaining Q for me. Ackley tends to tip his cap on pitches outside, to some extent.
Would suppose that if he looks for a pitch away, he can step up the middle and drive it. But that creates the inside/outside guessing game that Ichiro has finally started losing this year.