A little more than that from my perspective, Mike.
One, the hiring of Shannon down at Florida. He, and Smith, were Co-DC's last season. You can't quite call it a promotion, but definitely could say he's been given the reigns.
Two, the average pay of a defensive coordinator in the SEC is now at roughly 1 million. A move that allows Arkansas to "keep up with the Joneses" fits as well.
(BTW, speaking of DC pay: Here we have Muschamp making around 1.7 per year. Miss State gets Diaz to return for a three year deal with 1.8. That's NOT keeping up with ANYONE.)