Broncos back-to-work FYI

Readiness factor: The Broncos are a weird mix. They have a lot of veterans, and safety Brian Dawkins led several weeks of player workouts during the lockout. Yet they are rebuilding and will rely on young players. Denver will probably start five rookies and will be looking for several contributors in free agency. So the final makeup of this team is unknown.

Biggest challenge: The Broncos will probably be the most challenged of the AFC West teams because they are in the middle of a big transition. They are starting the John Fox era, and he has yet to see his team up close. The team is dealing with change once again on defense. Dennis Allen is the team's sixth defensive coordinator in six years.

Is it Tebow time? The biggest on-field question is who will be Denver’s quarterback. The team would like to trade Kyle Orton, but he will compete with second-year quarterback Tim Tebow if Orton is kept. The Broncos would have liked to see Tebow in the offseason, but they will have to make a decision very quickly at the most important position on the field.

Key players without contracts for 2011: Tackle Ryan Harris and defensive tackle Marcus Thomas.