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.261/.317/.403 over 1999 plate appearances, call him a +10 Center Fielder. If he can get back to that, he's better than a 3 WAR Player.
Cameron Maybin had almost the same line last year (.264/.323/.393) with a +9.5 in Center. He was worth 4.7 WAR. If Gutierrez can just be the player he was in 2007/2008 (.255/.311/.419) that would be about a 100 OPS+.