The Jags will be without WR Troy Williamson for the showdown with the Bills Sunday, as he missed his third straight practice on Friday. Williamson has been slowed by a thigh injury. The WR core will enter Sunday a bit thin and banged up – Matt Jones (hamstring) and Dennis Northcutt (back) are probable. Northcutt sat out practice Thursday and Friday. Receiver Jerry Porter (hamstring) practiced all week, but is still questionable. Look for second-year WR Mike Walker to make his debut for the Jags in the matchup. He didn’t play at all last season due to a knee injury.