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It's 3 wins. If the M's had a good alternative at catcher, then sure, move Montero. But when Olivo and Jaso are the other options, and you are trying to get Prince Fielder while Smoak is still on the team, then leave him at catcher for now. If the M's develop or trade for a good, cheap backstop, they can always make the move then. But for now, Jesus behind the plate is best for the team.