Didn't Iowa win a logo infringement case against Southern Miss.?
Not really an infringement suit. They got USM trademark registration canceled by the USPTO, which meant USM would gave lost a lawsuit if Iowa brought a suit.
Trademark cases are very subjective, and I'm not saying the USPTO was necessarily right, but you cannot just look at the logos side by side and say they are different. They rarely appear side by side in the real world.
They question to be answered is whether consumers are likely to be confused by the existence of the two logos. Is it likely someone would see the USM logo on something and think that thing was sponsored by Iowa, or vice versa.
And it doesn't have to be ALL consumers, or even a majority of consumers. Just a number that is above the deminimus number of idiots out there who are confused by anything.