To me it would make sense because Gus is tired of being on the "hot seat" continually. That seems crazy to say when they're having a great season, but the line between 9-3 and 7-5 is not that wide. I could see him thinking he's got better job security at Arkansas.
(Part of why the Mullen to... rumors don't get me riled up until a true blue blood opens up. He's really got it made in Starkville.)