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So should the Rangers bring back Zuccarello?
It's not as easy as it looks.
Yes, Zuccarello can be an asset on the power play, and the Rangers need as much help as they can possibly get.
But, that's all he does. He's marginal at best at even-strength, and offers nothing defensively.
Here's what I foresee happening: Zuccarello makes a splash in his first few games, but begins to see less playing time as Tortorella gets frustrated with his lack of defense. That lack of playing time makes him cold entering the game for the power-play and he's no longer as dynamic as he was when he first got here. That leads to some healthy scratches and then him going back to Russia at the end of the year.
My reasoning behind that is simple—you cannot play for Tortorella, or in the NHL in general, if you do not contribute defensively.
Consider this: Chris Kreider has offensive skill and would probably benefit the Rangers on the power play. But his lack of defensive awareness leaves him on the bench more often than not. He's averaged just over 10 minutes of ice time per game. J.T. Miller, on the other hand, is playing close to 13 minutes per game.
Zuccarello may help on the power play, and let's not mince words, they need help. But a power-play specialist will not gain much traction with Tortorella and it seems like he'll be spending more time in the press box than on the ice.
While it can't hurt, the Rangers should pass. They have limited cap space, and shouldn't waste it on someone who is only going to be playing for a few minutes per game.