The Broncos’ 2016 first-round pick is not ready for a starting spot. That was the determination coach Vance Joseph made as he announced Trevor Siemian — not Paxton Lynch — as the team’s starting quarterback on Monday. Denver’s 2017 first-round selection? He’ll occupy a major role from the start of his career. Joseph officially named Garett Bolles, the 20th overall pick in April’s draft out of Utah, the team’s starting left tackle. The move doesn’t come as much of a surprise. Bolles received the bulk of the first-team repetitions at the position during training camp and started both preseason games. Outside of several holding penalties in Saturday’s game against the 49ers, Bolles has been the most consistent player at left tackle, ahead of Ty Sambrailo and Donald Stephenson. “He’s won the job,” Joseph said. Bolles will be one of as many as four new starters on the offensive line. Free-agent acquisitions Ron Leary (right guard) and Menelik Watson (right tackle) have solidified their spots over the past month. Matt Paradis, who will make his first preseason start Saturday, will reclaim his role as the starting center after participating in every offensive snap in each of the past two seasons.