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It is no secret that the New York Yankees lineup is starting to get older pretty quickly. Montero was expected to inject some youth into the lineup and be a mainstay for years to come.
Alex Rodriguez cannot be expected to provide offense towards the end of his contract, and someone is going to have to pick up and take over as that powerful slugger in the middle of the lineup.
That person was supposed to be Montero.
Of all of his abilities, it has always been stated that Montero's bat was his best asset. He is projected by many to be a full-time DH in his career, as he is not very solid defensively.
Losing that type of bat in the middle of your lineup is a difficult thing to overcome, even if you are the Yankees.