I have a theory about that. Arkansas wanted to hire Gus last year. The guy they hired instead hasn't exactly panned out. In fact, they got worse as the season progressed. Maybe the powers-that-be at Arkansas told Gus that if he can get the buyout down, they'll fire their current coach and bring him in next year. That's a win-win. Gus goes home. Arkansas gets the coach they want. The buyout they have to pay Auburn is less. And Auburn gets rid of Gus. I guess that makes it a win-win-win. Only we know that kind of thing never works out.
One thing is for sure - there's a lot of fine print in Gus' contract that we aren't privy to. He wouldn't agree to the terms, as we know them, if it didn't benefit him in the long run. His agent wouldn't allow that.