‘Shell, 31, joined the Bills as a free agent this off-season after stints with the New York Jets, Seattle Seahawks and Miami Dolphins. The veteran was expected to compete to be the team’s swing tackle behind Dion Dawkins and Spencer Brown. Without Shell in the mix, David Quessenberry becomes the frontrunner for the job. Buffalo is likely to carry at least four offensive tackles which means they could keep a young option on their 53-man roster such as Tommy Doyle, Richard Gouraige or Ryan Van Demark. Another option is signing a veteran in free agency or trading for a tackle.’