At what point does a quarterback go from being young and worth developing to being an also-ran? At 27, we may be about to find out with Mallett. He’s battling with Hoyer, a free agent signee who really fell apart as last season progressed. If Mallett can’t hold Hoyer off, is he worth keeping around going forward? Further, it’s hard to get excited about the future in Houston with Hoyer as a starter.

Location: Paul D. Bowlen Memorial Center, Dove Valley, Colo. & Sports Authority Field at Mile High, Denver, Colo.

Player you’ll be buzzing about: DE Malik Jackson — Jackson is in the final year of his rookie contract. He’s set to become a full-time starter this season and will want to show the team he should remain a starter.

What to watch: Peyton Manning is the Broncos’ offense at this stage, and as he gets older all eyes will be on how his throwing arm is holding up in areas like velocity and accuracy. Unfortunately for Manning, the biggest question mark on the team is its offensive line. Four of the five starters from the end of 2014 are gone, and the Broncos will be conducting battles at multiple positions.

Most important position battle: Manning won’t be around forever and the Broncos insist they want to run a more balanced offense. That means they’ll run it more, but will it be C.J. Anderson or Montee Ball carrying the football the most?

Player you’ll be buzzing about: RB Latavius Murray — In his second NFL season, Murray only carried the ball 82 times, but he made the most out of them with two touchdowns and a 5.2 yards per carry average. Although it’s still too early to know what Murray can do as a full-time starter, the Raiders could have a real superstar on their hands.