I don't know, except the splash from UI and ISU is way bigger than UNI, which would not add much to the splash, just a little additional ripple. Targeting athletes for retribution doesn't add up to me, but you could be right. It seems if they wanted to do that, there would have been more painful, and less politically damaging ways to go about it.
To me the biggest irony in all of this is this weird relationship between the state and gambling, which has been around for long time. Just one example, but fitting for this, betting on sports by athletes - BAD. Playing the state-sponsored lottery to win tickets to Iowa or ISU games - GOOD. And to add some extra icing, featuring kids in the ads that promote this lottery game. "Hey mom and dad, can you play the lottery so we can win some tickets to the Hawkeye game?!". Bizarre.