Paxton Lynch stood in front of his locker at the Broncos’ facility with a half-filled garbage bag at his side and a look of shock on his face. The feeling was shared by others in the room as players cleaned out their belongings and turned in their hefty playbooks before embarking on an extended offseason. The Broncos’ quest for a Super Bowl repeat fell short, along with their coach’s tenure. Gary Kubiak resigned that Monday, a day after the season-ending victory over Oakland, ensuring an offseason of uncertainty and a second year of learning and change for Lynch as a new coaching staff, led by Vance Joseph, would soon roll in. Out were not only Kubiak, but also offensive coordinator Rick Dennison and quarterbacks coach Greg Knapp, with whom Lynch spent most of his hours learning as a rookie. In were offensive coordinator Mike McCoy and quarterbacks coach Bill Musgrave, two former Broncos who returned to Colorado to revamp the offense. Lynch, the 6-foot-7 quarterback general manager John Elway traded up to nab at No. 26 in last year’s draft, had just begun to feel comfortable with Kubiak’s complex offense that required six-inch binders to explain in full.