this is the first time in D5 that i can remember off the top of my head where each #1 seed made it out of each region
I looked at this once. Actually, it was in relation to something else I was taking a look at, the overall #1 computer point team in a given division winning the playoff championship vs. the AP Poll winner winning the playoff championship. The AP Poll is more accurate BTW.
Anyway, while looking at data for that one subject I also noticed that it is extremely rare that all four #1 computer point teams win their regions. Coming into this season it has only happened 10 times to my knowledge and five of those were prior to 1985 when four teams per region started to qualify. I believe the last time it happened was in D2 in 2019. It has never happened in D6 or D7 to my knowledge and only once prior in D5 and that was in 1983.
Of course, prior to 1980 every team that qualified was a #1 so the above is for 1980 -2021.