You don't see too many BCS schools running that kind of offense besides GA Tech. Recruiting could be very difficult. I agree that Calhoun is getting results with the little talent he seems to have. Gray running that offense for 2 years would be interesting.
Screw it after reading his resume I'm all for Calhoun. He has coached special teams, offense and defense. Too bad he's an Air Force grad. I'm guessing he's loyal.
I doubt there is any chance Calhoun would come here. But if that somehow happened, I wouldn't lose any sleep over the offense he runs at Air Force. Part of what makes him a great coach is his ability to build a team (and offensive scheme) to match the type of recruits he can get.