I know this is a Linton thread, and the math guys may flame me. But since you posted rankings that included our (excellent) pass defense, I thought it might be interesting to look specifically at rushing yards allowed compared to our DL personnel. In 2017 we had the 99th ranked defense against the run (196 o-ypg) - with lots of size up front (280-320 with Ruff, Slayton, Samuels and MacW). But they were even better the next year (2018, sans Samuels) with more experience and a good offense: we moved up 34 spots to 65th (162 o-ypg).
After Slayton left, in 2019 we dropped from 65th to 108 (201 o-ypg), stayed around the same in 2020 (105th, 209 o-ypg). But interestingly, in 2021 when we had some size and experience (MacW 285 and Josh Black 290) and NOT a great offense (ranked 93rd ypg), we made the biggest jump in recent years moving up 78 spots to 27th (127 o-ypg). Maybe this was TW lol.
But this year with MacW and JB gone, we were undersized (all interior guys at or < 270 Lockett, Darton, EFC ) and didn't have a lot of experience. So we dropped 39 spots to 66th (149 0-ypg) and got dominated on the ground in some losses (ND, Pitt, Clemson).
Smaller shifts in ranking probably don't mean much. But huge jumps (30-80 spots during a 6 year period with different DC's) indicate that regardless of offensive prowess or scheme ... size and experience have played important roles in our run defense.
Check out the 2021 College Football Team Defense and more about College Football at Sports-Reference.com
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