‘Durability was never an issue for RB Shaud Williams in college, where he amassed 4,659 all-purpose yards at Texas Tech and Alabama. The rigors of a 16-game NFL season are another story, which is why the rugged 5-7 ball carrier packed more weight on during the off-season. “I sat down with the coaches at the end of last season and they felt that it would help me hold up,” said Williams, who’s in the mix for the Bills’ backup running back job behind Willis McGahee now that Travis Henry has been traded. “I put on about 8 pounds. I’m up to about 198, 199. I can tell the difference. I’m still getting used to carrying it but hopefully by the end of camp, I’ll be ready to go.”‘