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I'm really rooting for Montero to stick at C.. You are talking two different ends of the defensive spectrum between C and DH. A whopping 30 run full-year positional adjustment.
30 runs of hitting value was roughly the difference between Joey Votto and Melky Cabrera in 2011 (ONLY hitting runs).
Even if staying at C hurts Montero's hitting ceiling a bit, it really increases his value significantly if he can play it to a mediocre level.