I don't really know any details, but I'd hope Levin wanted to play more and understood she wasn't likely to ascend much beyond a limited role player in her next two years at Iowa. I still don't understand why she wasn't redshirted her first year. Again, I don't know any details but I hope she weighed all the advantages of staying at Iowa, but understood her likely path if she stayed and just wants to play more over the next two years.
On the other hand, Deal seems to be leaving because she didn't play enough this past year. Because there certainly seems to be plenty of opportunity in front of her at Iowa if she were to stay.
I think Levin makes perfect sense. There was not a more engaged Hawk on the bench than her all season. She was forced into duty on a few occasions due to injuries and foul trouble, and she always gave her all. But her ceiling is limited. That is also why she wasn't red-shirted (you don't tie up a scholarship for another year for someone who won't be a difference-maker). Because of her demonstrated love for the team, I thought she would come back, but she is never going to average more than 5 minutes per game for the Hawks. But she could go to the MAC and be a much bigger contributor, and that makes sense.