The Broncos have signed running back Jonathan Williams to the practice squad, as Ian Rapoport of NFL.com tweets. He’s receiving a sizable salary that equals out to $510K over the course of the season, which indicates that there was a healthy market for him after the Bills cut him loose. The minimum practice squad salary is just over $7K per week. 
Early on this offseason, Williams seemed poised to step into Mike Gillislee‘s role as LeSean McCoy‘s top backup. He lost ground in that competition, however, and the Bills decided to cut him loose rather than pay out the full value of his contract. The Broncos and 30 other teams declined to pick him up off of waivers, thereby picking up his deal and giving him a roster spot, but multiple teams wanted him on the taxi squad. The Broncos won out over the competition.
The Broncos will roll into the season with C.J. Anderson, Devontae Booker, Jamaal Charles, and De’Angelo Henderson at running back. Booker’s status is up in the air to start the season, so there’s already a potential roster opening for Williams if that injury lingers.