The rookie defensive player Sam Williams was involved in an auto accident in Plano about 2:15 p.m. on Thursday afternoon. He was taken to the hospital due to precautionary reasons after his vehicle was reported to have been struck by another vehicle just five miles away from the Cowboys base in Frisco. The Cowboys medical team could visit with Williams and Williams, who will be examined again on Friday morning. At present, the Cowboys believe that J.R. be able to participate this Saturday in the game against the Eagles at AT&T Stadium. The team will conduct an hour of walk-throughs…