I'm not a guy who thinks every head coaching candidate for football and basketball has to have some kind of tie with Marshall. Having said that, Brannen is a proven winner at the mid-major level. Also, I have never heard one of his players at NKU come forward to complain about the way they were treated by Brannen. Obviously something happened at Cincinnati, but I think it was a bit overblown. It definitely isn't something that should exclude Brannen from ever getting another head coach job for the rest of his life. He's hungry for another chance. I think he will give his all to make sure he is successful with his second chance. He's still relatively young (50) and yes, he does have ties to the school. IMO, he would be a great candidate to replace DD next season, IF Marshall's administration grows a set and gets rid of DD after the season ends.
As far as a hiring a D2 coach. I would have no problem with this approach. With the high turnover of college rosters because of the transfer portal, I think D2 coaches are more equipped than ever to take over a D1 program, because there has always been a lot of player turnover on that level, so those head coaches are used to doing major roster rebuilds from season to season.