I think 4 BIG teams (Rut, MN, IL, and MD) all have interim HCs. I think he would've grabbed a NFL or P5 job if he wanted to before coming to YSU. He never had to come here, but rather wanted to. I think he likes JT being the Prez, and appreciates that support after having conflicts with administration at NE. Strollo is a moron and an incompetent, but he likely doesn't antagonize BP. BP is getting well paid through the 2018 season, and after that he will be gone.
Having had lived there for ~9 years, MN is a miserable place to live for a multitude of reasons, and would make Lincoln NE seem paradise.