Johnson rushed once for minus-1 yard and added one catch for 33 yards on two targets in Thursday's 31-10 win over the Dolphins.
Johnson watched James Cook score three first-half touchdowns, while rookie Ray Davis got most of the mop-up duty with the game out of reach, finishing with nine carries to Johnson's one. While it's a positive that Johnson is no longer bothered by the knee injury he picked up in the season opener, he seems to have fallen to third on Buffalo's running-back depth chart heading into a Week 3 visit from the Jaguars.