I was never sold on Dion. He has never proven anything on an FBS level. While he had a great record in FCS it is a whole different ballpark than the FBS
Jackson State was already a known brand in the SWAC. On top of that Dion's flash and celebrity culture was able to recruit the best "of the rest" in that level, plus the 1 or 2 FBS level players that were willing. That's no longer the case when you coach at the FBS. Getting the best "of the rest" isn't good enough. Now you are competing with known brands and the (supposed) top tier coaches and support structures for college football.
He became the big fish in a small pond to a small (but flashy) fish in a big expensive over the top aquarium. I'm NOT saying Dion will be successful, only that he is unproven in the FBS level.
Meanwhile Golesh has experience and success at the top of FBS football.
While he wasn't my #1 choice of the rumored candidates, I definitely preferred him over Dion
In addition.. I know any successful coach here will be poached to one of the "Power whatever" conference teams. But I would feel that Dion would have one foot out the door from day one, no matter how good he's doing here.