This is pretty good information, but more helpful would be the yards/play and points/play given up by our defense compared to the conference average for that year. The style of play has changed so dramatically that decades-long comparisons like this have to be taken into account. In short, offenses are better now than they used to be (and not just because they are going faster, which is already accounted for by looking at it per play).
Oh, that's a fair point, but I don't have time for that. The acceptable numbers certainly changed as the game changed in the 00s.
Yep, I don't have time either. The defense that is way "underrated" according to the chart is 2012 defense. They were a much better defense than some of Snyder's defenses in the early 90's (A. Brown, Meshak, Nigel, Zimmermann, etc.), but the chart suggests otherwise.
I sure do miss Arthur Brown.