I'm not sure your "facts" are as factual as you'd like to believe.
Michigan maybe played a slightly tough
er but by a pretty thin margin. Florida looks to have played the toughest schedule.
Michigan beat 3 teams that finished the year ranked (#16 Penn State - 9-3; #12 Ohio State - 10-3; #9 Washington State - 10-2)
Nebraska beat 5 teams that finished the year ranked (#18 Washington - 8-4; #8 Kansas State - 11-1; #23 Missouri - 7-5; #20 Texas A&M - 9-4; #7 Tennessee - 11-2)
Your claim about Michigan beating six Top 25 teams is deceptive. Michigan played Colorado, Notre Dame, Iowa, Michigan State and Wisconsin who were ranked earlier in the year. They finished 5-6, 7-6, 7-5, 7-5 and 8-5 respectively so they weren't nearly as good as those initial rankings suggest and all finished the year unranked.
Michigan beat Colorado at home the first game of the year. The Huskers played at Colorado the last game of the year. On the road. What had become a rivalry game. And Nebraska was up 27-10 until Colorado scored two late TDs to get closer. Also, Michigan beat Colorado by 24 which I believe is a three-score game.
Also, every computer ranking that I could find -
Sagarin,
SRS,
Congrove,
Howell - has Nebraska as the better team.
That would be my rebuttal if a Michigan fan were to bring up those points, which I think you just did.