It is possible Bo Nix does not return from his fractured right ankle until training camp. The Broncos’ starting quarterback recently had a successful cleanup procedure during a scheduled follow-up visit with Dr. Norman Waldrop III, who performed the initial surgery in January, a source confirmed to The Denver Gazette. It was an expected part of Nix’s recovery. However, the second surgery alters public expectations surrounding his availability for the offseason program. Nix suffered the fractured ankle on Jan. 17 in an AFC Championship playoff loss to the Bills. He later described it as a “simple bone break” that would allow him “to start training back the same time I was going to start.” Broncos leadership in subsequent interviews echoed that timeline. In March, controlling owner Greg Penner said there were “no concerns at all with OTAs.” General manager George Paton added that Nix was “ahead of schedule” in his recovery. On Saturday, Payton confirmed a Nix follow-up visit with Dr.…