Why they're legitimate contenders: John Elway gambled by banking that Peyton Manning would return to the ranks of the elite after missing an entire season following multiple neck surgeries, and he won big. The four-time MVP has been outstanding over the first half of the year; Manning's ability to dramatically improve the Broncos' offense has made them a serious contender in the AFC. The veteran quarterback is in the midst of a sizzling run, notching 17 touchdowns while giving up just three interceptions over the past six games. Most importantly, he's orchestrated several improbable comebacks that have created an incredible resolve in the Broncos, who now believe no deficit is too big to overcome. Given their confidence and offensive prowess, the Broncos are destined to be in the mix at the end.