I don't really get the gigantic concern with wanting a guy who has some coaching in "SEC country". It would be one thing if he is a southern guy who has always coached down south, but Mullen is part of the New Hampshire Mafia (Chip Kelly, Gary Crowton and himself), so there wouldn't be any like heartstrings being pulled to go back home.
It would really come down to money and the kind of job it is. If he does really well and the Alabamas, Georgias, and Floridas come calling then that is a bridge we will have to cross. However, I am not sure that the fact that he has coached in the area would make him more likely to get a call than any coach who comes up to MN and made us a winner. These schools are only interested in elite level coaches. So, if (hypothetically), Troy Calhoun came to MN and won 10 games and brought us to a January 1 Bowl game, I'd imagine he would be coveted by SEC schools looking for a coach.