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Backs figure into roster decisions

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On a roster deep with backs and precious little space at the bottom, the Chargers' decision before the Sept. 5 final roster cuts will come down to keeping Bennett or fullback Mike Tolbert. With the Chargers not believing Darren Sproles is an every-down back, a scenario without Tomlinson would require them to look beyond their No. 2 tailback. They will keep fourth-round pick Gartrell Johnson, because they like his potential. But they almost certainly won't want to hand him the ball 20 times or more in a game this season.