Buffalo Bills quarterback Josh Allen (concussion) and rookie running back Devin Singletary (hamstring) are both questionable to play in Week 5 against the Titans. Allen returned to a full practice on Friday, so it looks like he's cleared the concussion protocol and should be out there this Sunday, albeit in a tough matchup that will have him as a QB2 in fantasy if he plays. Singletary has missed the last two weeks but has been practicing in a limited fashion. If he returns to action, he'll ...