Two words: Gerry Faust.
I've seen Dave Logan up close while coaching Mullen. I'll tell you right now that he's not that good. His MO is to follow the side judge up and down the field (at least as long as the play remains within the coaches box) and he chirps all freaking game long. His assistants do basically the same thing, until Dave pipes up and says "Hey, I'm the only one who talks to the officials!" Seriously, I swear to God I've seen this happen. He has success at the high school level because he has name recognition within the state, and can openly recruit to Mullen. He has, and I sh!t you not, somewhere around 20 assistants. Even with all of these advantages, he has won exactly ONE state championship at Mullen. And we want this guy to be our head coach? Awful idea.
As was mentioned before, if he wants to come in to be a position coach, like RB or WR, I'd be fine with that. Otherwise, no thanks.