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One thing that makes me feel a little better about Martin, as someone pointed out, is that he should be easily tradable (as long as his contract is reasonable). Even if he gets four years, and Zunino works out, someone will always want/need a 90ops+ defensive wiz proven MLB (TM) catcher.
That might actually be advantageous, with Martin to mentor the young pitchers and mentor Montero for another year.
Wouldn't be the offensive add that we need, though.