Backup: Brock Osweiler

Best-case scenario: A full year of play in 2012 removed what little rust the veteran had. Also, a new weapon in Wes Welker will help make Denver a lock for the Super Bowl and he'll move out of John Elway's shadow. No more fuckups like this!
Worst-case scenario: A freak play aggravates the injury that threatened Peyton's career in 2011. *cues the soundtrack*