Buffalo Bills quarterback Josh Allen (concussion) remains in the league's concussion protocol on Thursday. Allen has done non-contact work at practice this week, but he's not quite there yet. That could come on Friday, but he's definitely questionable to play in Week 5 against the Titans. Even if he does play, Allen will be more of a QB2 in a tough matchup on the road. Backup Matt Barkley would get the nod if Allen isn't cleared, making it hard to trust any of Buffalo's pass-catchers, namely ...