'“I’m not frustrated at all because I know what I can do and I know how good of a football player I am,” Williams said after the Bills’ practice Tuesday. “Whatever role I have, I’m going to fill it to the best of my ability. That’s what I’m worried about, instead of who’s on the field first. It’s important to some guys. Of course I want to be a starter, of course I feel like I worked for it, but with Corey being the starter, I’m going to back him up and help us win games.”'