Rookie Garett Bolles making progress toward starting lineup

ENGLEWOOD, Colo. -- The Denver Broncos open their mandatory minicamp Tuesday, and that three-day affair will formally close their offseason program.

When Thursday rolls around there will be the requisite missives tossed around about the “good work" that got done or how “we got better." That indeed happened in many ways, but the Broncos will still adjourn with questions to answer.

That makes the next three days the last look -- until July -- at some front-burner items like:

Where do things really stand at quarterback? Broncos coaches have kept a keen eye on what Trevor Siemian and Paxton Lynch have done since players returned to work in April, but the real on-field competition for the job will…