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Smoak had the same pattern. "Golden" in the minors until hitting AAA at age 22, at which point mediocre. Then solid again back at AAA at 23.
Don't know if it's just an odd thing or a harbinger of doom. Based on everything else they did in the minors, both Clement and Smoak should be, at a minimum, solid MLB regulars. Sandy's bearish outlook on Smoak doesn't help.
I don't know if it's been noted here, but the "buzz" on mlbtraderumors.com was that if a Fielder signing happens, Smoak would be put on the market.