OK so let us look at this from a business perspective. If he is indeed making the move then since he has no future contract w/MU there is no payout so So Miss can use that expected expenditure to add to his salary ... he will make more $$$. He is effectively the SB coach of the year so they get a top notch proven coach for a bargain.
Since they suck, he will have at least a few years to turn things around before expectations rise.