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If he was a RHP, then no, but lefties are hard to get and if Furbush takes a liner off the noggin on April 8th we can't afford to have our bullpen structure fall apart.
You can send Snow to AAA, let Furbush be your 2nd lefty/long relief (or 6th inning, whatever you want to call it) and if Sherrill's elbow unwinds like a ball of twine then Charlie can slide into the LH setup role and Snow (or whomever) can come up for long relief.
Easier than taking Robles out of AAA and making him your 8th inning-in-a-tie-game-in-Yankee-Stadium dude right off the bat.
~G