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Let's take the mythical replacement player out of the argument and plug in some truly freely available talent: James Jones is freely available talent for center field: .564 lifetime OPS vs. .666 for Martin. Actually, I can believe it. But it does take expecting a certain level of defensive play in CF. I suppose a case could be made for Justin Ruggiano, who played the corner OF especially well for the Dodgers last season. We could go that route again. But then, you talk a non-linear impact of suckage - shaky CF defense.