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I expected the "order" for Ackley would be OBP first, then average, then power.
What I suspect changed this is the new (organizational?) focus on aggression at the plate. The honest truth is that Ackley's eye is BETTER than what he has shown so far in the majors.
So far, he's running a 9.2% walk rate, when 16% is both where he started and ended his minor league career. I suspect that he has (so far) benefitted slightly from MLB pitchers 'unimpressed' with his rep thinking -- "Yeah, c'mon and try to hit MY stuff, Meat."
That error will correct itself in short order.
He's running a 61 isolated BB rate at the moment. That'll eventually settle around 100.