I will give you some personal insight from a BYU personal friend and super fan about Mendenhall:
I have a hard time believing he would come out of retirement. He’s an outstanding defensive coach, and not a bad head coach. He’s quirky as all get out and a really odd duck. Overall, I like him though.
He’s a solid fundamental type of coach. He bothered the BYU folks by publicly saying that football was not his first priority; probably his third behind the church and his family. Nothing wrong with that but probably not best to publicly proclaim in a press conference, even the religious BYU folk want football to be their coaches top priority. They gripe about him a lot near the end, but believe me, they would give anything to have him back.
In my opinion, Syracuse would be lucky as hell to have a Head coach as qualified as Bronco. A man of faith, discipline, and football success. I’d propose keeping a few of the current staff for year 1, so Syracuse wouldn’t have to incur multiple position and coordinator buyouts. Basically just replacing Dino with Bronco.