Footballscoop.com gets a lot of coaching info. I have no idea how accurate it is, but the site has an item on Iowa.
It’s dated May 13. Scroll a little more than halfway down the page. It says Iowa will hire within for a defensive graduate assistant. Last season, Seth Wallace completed his third year as the defensive grad assistant.
GA’s don’t stick around schools forever. It’s a foot in the door. I have no idea if someone left or whatever, but there that is from Footballscoop.com.
EDIT: Thanks to Nathan, it looks as though Wallace has taken the defensive backs position at Valdosta State. Just scroll down another day to May 12. Would the “hire from within” perhaps be LeVar Woods?