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Bring up all the kids! I'm with Doc on this one. Felix, Iwakuma, Hultzen, Erasmo, Paxton. The only chance the Ms have is by catching lightning in a bottle. They can ONLY do that with premium arms. I'd let Walker stay down for a minute, pitch him out of the bullpen when he comes up, or until someone gets hurt, or when his performance dictates that he's one of the best 5 arms that give you a chance to win. No reason for Marcum. That seems like a waste of resources.
I actually like the way the offense is being constructed under the circumstances. Short term commitments to see how things play out. Think 2014