I can't logically answer the question and am no expert at all.
The bottom line is recruiting isn't an exact science. Every kid is different. There is no blueprint for how Thomas Fidone will process his recruiting and arrive at a decision. Fidone is his own person with his own private thoughts, like the rest of us, which are subject to vacillation.
What I throw out there is mere spitballing based entirely off what Fidone is willing to state publicly and what I know to be true of common behaviors of past recruits.
1. I don't know if it's actually down to Nebraska and Iowa. I'm guessing Fidone ponders what it would be like to wear many different jerseys. I think at this point, though, it's pretty clear he's deciding between Iowa and Nebraska.
2. I grew up a Hawkeye fan and dreamed of playing for Iowa. My senior year in high school was Hayden's final year. Had I been a prospect and offered a chance to either play at (e.g.) an established program like a Wisconsin or given an opportunity to fulfill my childhood dream by playing for Iowa, even walking into an obvious rebuilding situation, that would have been a very difficult choice. Especially if I believed Wisconsin excelled at putting players of my same position in the NFL. Consider that for a moment, and then you should be able to understand why Fidone hasn't given his verbal to either school yet.
3. I like Iowa's chances. They are a program in good standing right now, the coaching staff is second to none, and they are Tight End U. In the end, I think that will be too difficult for him to pass up. Nebraska is not a program that appears to be trending up right now and Frost doesn't utilize tight ends like Iowa does. The longer this goes on without Fidone giving his verbal to Nebraska the greater the chance he will end up at Iowa.
