Lol…you should spend some time and see actually just how many (few) head football coaches are actually CORE subject (classroom) teachers anymore.
At smaller schools sure…but I would bet of the 320 (or so) football playing schools, it’s less than 20%.
I tried to do an informal poll of this once. PE/Strength were obviously the most popular positions held- followed by some “Admin” responsibilities (AD, Dean of Students, etc), Study Hall/Lunch monitors was another popular way to fill time.