Vance Joseph declared the Denver Broncos’ quarterback competition wouldn’t begin until training camp. Paxton Lynch must start competing this week. A first-round draft pick a year ago, Lynch ended last season a distant second to Trevor Siemian as the Broncos’ starting quarterback. By all accounts, the past five weeks of offseason work has not changed the order. If Lynch is going to become ready as an NFL starting quarterback sooner rather than later, he may need to begin making his move this week as the Broncos’ open their organized team activities (OTAs) with sessions Tuesday, Wednesday and Thursday. Unlike past offseason practices, OTAs allows the offense to scrimmage against the defense, so long as the players don’t wear pads and there is no tackling. As the play is still at 100 percent speed, the matchup between offense and defense allows for more serious player evaluation. It just won’t be the be-all of player evaluation. “The competition is going to be in the fall,’’ Joseph said March 1 in Indianapolis during the NFL Scouting Combine. “It won’t be in the spring. The spring is going to be a learning tool to learn Mike’s system.’’ Mike McCoy was the Broncos’ offensive coordinator from 2009-12 before he took a four-year leave to become head coach of the San Diego Chargers. McCoy is back in Denver as the team’s offensive boss and his system promises to be more passer friendly than the one implemented by Gary Kubiak the previous two seasons. When Kubiak retired as Broncos’ head coach following the 2016 season, Joseph replaced him. Joseph is a defensive-rooted coach who hired McCoy and quarterbacks coach Bill Musgrave to run his offense. Siemian is the man to beat to run that offense. He beat out veteran Mark Sanchez and the rookie Lynch for the Broncos’ starting quarterback job last season.