Cook (toe) practiced fully Thursday.
After being listed as a limited participant in Wednesday's walkthrough, Cook worked fully a day later, which sets the stage for him to reclaim his lead role in the Bills backfield Sunday against the Titans. In Cook's absence in this past Monday's 23-20 win over the Jets, Ray Davis -- who was limited by a calf injury Thursday -- carried 20 times for 97 yards and caught all three of his targets for 55 yards. If Davis is available this weekend, he'll be in line to move back to a complementary role behind Cook in an RB room that also includes Ty Johnson.