The stat was biggest year over year turnaround in wins in FBS between 2020 and 2021.
Michigan was second on the list with a +9
Yeah-they went 2-4 last year and 11-1 (so far) this year, which is a difference of 9 wins. BUT THEY ONLY PLAYED 6 GAMES LAST YEAR.
Yes, Michigan is much better this year than last, but that metric is not only useless, it's entirely misleading.