I've been diving into defensive numbers again this morning. I've been struggling a ton with the discrepancy between what I've been seeing versus what the predictive numbers are saying about the quality of our defense. Watching the games it feels like our defense is in the lower half of the SEC and the traditional stats (points + total yards) agree.
I'm seeing three major factors that play into this.
1. Our ability to create turnovers and generate points is wildly underrated.
2. Our SOS to-date has been really good.  (We've played 9th hardest schedule in terms of offenses faced.)
3. A lot of the stuff that looks bad in stats has been in garbage time.
Points allowed doesn't tell the whole story, particularly with Heupel's philosophy. Many (falsely) claim Banks of being overly conservative because they see him allow a lot of dink and dunk down the field, but that's not at all true. Heupel's / Banks' entire philosophy is built around creating havoc: negative plays and turnovers. To do that, they're content to let drives stretch on for a bit to allow more opportunities to create big negative plays, and it's actually working quite well.
To help account for this, I've taken points allowed per drive, and I've done two things to it:
1. Remove garbage time
2. Adjust for turnovers. (-3.5 points for a turnover, -7 points for a defensive touchdown).
When you do this for all teams, we go from #113 in the nation in points allowed per game to #56, because the defense is generating 10 points per game above the average FBS team.
When you account for our schedule, the defense gets bumped up into the top 25-30 range, and in the upper half of the SEC.
We've also held every P5 opponent under their season average by this metric.
Syracuse: (Adjusted Points-per-Drive) 1.14 -> (Against Tennessee) 0.95
Georgia: 3.18 -> 2.21
Miss St: 2.04 -> 1.43
Arkansas: 2.49 -> 1.86
Alabama: 3.05 -> 2.72
Kentucky: 1.44 -> 1.17
TLDR: The defense is a lot better than the traditional stats show, because we're creating more points off of turnovers than anyone in the country. They need to start getting credit for generating 20% of the points of the #2 scoring offense in the country.