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To be fair, Varitek was a unique situation. He was one of Boras's first draft loophole guinea pigs and didn't play a game in the minors until he was 23, when the mariners inexplicably dumped him straight into Double-A. His path to stardom isn't an indicator of a typical catcher development path.
I like Moore, but the fact that Varitek didn't make the majors until 25 doesn't mean many catchers who do the same have legitimate star potential.