The University of Washington running back corps fell into even worse shape when the Spring Game finished up a month of practices on Friday night, with freshman Brian Bonner Jr. held out with a hamstring injury. Bonner, a 5-foot-11, 196-pound newcomer from Santa Clarita, California, was one of four Husky rushers -- half of the scholarship total -- who were sidelined and forced to watch the game go on without them. He joined Troy transfer Trey Cooley (knee), Oregon transfer Jayden Limar (ankle) and sophomore Jordan Washington (neck) as unavailable rushers for the UW, though his situation in dealing with "hamstring tightness" was deemed precautionary. "We need Brian to have the whole summer and be fully engaged in the offseason program," coach Jedd Fisch said. "There was no reason to have any setbacks [Friday] when we've got to get going." Bonner, a 4-star recruit, previously took part in at least 13 spring practices, which were followed by a walk-through and the Spring Game.…