7. BYU Cougars (6-0)

Last week's ranking: ninth

SP+ and FPI rankings: 29th and 29th

Odds of reaching 12-0, per SP+: 5.8%

What the Cougars did in Week 8: def. Arizona 41-19

Biggest remaining question: Can the offense score when it has to? Army and Navy have sucked up a lot of the oxygen in the Incredible Turnarounds department, but Kalani Sitake has pulled off something pretty incredible in Provo this year too. The Cougars have already topped last year's win total thanks to an almost weakness-free defense that has allowed more than 19 points just once. (And that was after they had built a 28-7 lead on Baylor.)

The offense ranks just 56th in points per drive, however. It has its moments, but the Cougars aren't particularly explosive and go three-and-out quite a bit. And in their two closest games, they scored just 18 points against SMU and scored just 6 in their past eight drives against Baylor. The defense has come through constantly, but the offense isn't trustworthy just yet.

Next test: Week 8 vs. Oklahoma State