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Ackley's immediate dominance has been suprising, but this is pretty typical of superstar HOF-level players. They usually only take 100-300 PAs of adjustment and many hit right off the bat. The late bloomer type superstar hitters are more rare.
I was expecting Ackley to hit immediately, but for the power to come next year. It came in his first game and has been here to stay.
Trayvon I'm obviously not very high on.