I obviously agree with you, but I was curious about it. Sadly, most of the websites completely disregard FCS games. I decided to use
https://api.collegefootballdata.com to pull all the drives for 2019 where a team was playing an FCS opponent. The average ppd was 1.07. For 2018 it was 1.16 and 1.03 for 2017. For reference, the average ppd for offense this year is 3.25
I must say, defense ppd against FCS is MUCH lower than I thought it would be. If anyone is interested, here is the (awful) code I used to get this data:
https://jsbin.com/zoqufiliyo/1/edit?js,output
I am currently installing
https://github.com/rlindholm/CFBScrapy so I can do this in a much cleaner way in the future.