Why did the Patriots keep so many running backs?

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Awaiting Brady's thoughts on offseason 433256	Gronkowski turns to back after arm surgery 433111	Blakely: Rivers returning brings stability to Celtics 432241
Can Lester and Buchholz carry Sox into the playoffs? 432231	Jagr goes back on ice after game to skate 432236	Beers: Tuukka won the game in the 2nd period 432216
Dupont, Beers on Bruins young defensemen 432196	Curran: Patriots haven't broached possible Gronk surgery 430641	Kyle Love released by Patriots 429221
Gronk tends bar for One Fund Boston 426526	Dickerson: The Argument to Bring Back Pierce and KG 426066	Merloni, Shaughnessy on Sox recent struggles 425571
Is Julien's job on the line in Game 7? 425566	Why do the Bruins have trouble closing teams out? 425541	Curran: Gronk, Edelman injuries can have impact 421696