Where Jacksonville’s mercurial 8-4 is defined by game-to-game vagaries, Indianapolis’ 8-4 is the result of a slow slide back to reality. After averaging 3.5 points per possession during their 7-1 start, that number was down at 2.0 over the last four games.

A pair of NFC South rivals kick off NFL Week 15 as the Atlanta Falcons visit the Tampa Bay Buccaneers on 'Thursday Night Football'. Both teams

Let's update our NFL Power Rankings ahead of Week 14. We also picked out X factors for the last five weeks of the regular season.

Week 13 brought drama as the Rams, Eagles and Chiefs all lost. So as we crown a new No. 1, we examine the best-case scenario for each team.