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They don't have you do that stuff in the minors too much if you're an elite hitting prospect, because the risk of injury is too high...but in the big leagues, with Wak as your manager, if you have speed to put the game in motion (and Ackley does), then you're going to run. I could well see Ackley coming up right this instant and OUT-HITTING Chone Figgins' current slop. He could easily post a .200/.350/.300 line in Seattle today.
But no need to rush him...let him play AA til the AS break and finish the year in AAA...then you can let him try to make the club next year, but if he doesn't it's no disaster...you have Lopez in 2011 for one more season and then you can replace Lopez with Ackley when he's ready.