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I really think that the gain in offense for moving off catcher is overblown. Catchers develop later than 1B/DH because of the difficulty of learning position. They also decline earlier thanks to the wear and tear.
Whether or not C actually caps offensive ceiling is impossible to tell without re-doing a lot of these careers. MOST prospects fail or underachieve which is why I think we get so much of the second-guessing.
Given the massive amount of value in being able to play even a poor C over a strict DH, I'm hoping the Ms continue to develop Montero as a catcher. Let his development decide whether or not he can stick at catcher. He'll get DH time regardless with his hit ability and to keep him fresh.