I think any number of things are possible. Chet's at a point where he may need to move a bit and build his network, particularly in the east, for him to get a head coaching gig he would actually be interested in (like a Patriot League or Northeast gig, maybe even A10). Also possible he's overall ticked at being down the pecking order and having a guys like Hansberry or Harris recruited over. Also possible he and Brad just don't get along.
Hope we can retain Hansberry as I think he's in line to a be a solid rotation guy next year whether we sign a new 4/5 or not.