Sexton probably has something in the works for him.
His best bet would be to leverage those back to back 9 win seasons, starting the 2016 season ranked #1 in the nation preseason and then back up to #10 at some point.
He could downplay negatives based on injuries and play up his recruiting rankings.
I'd like to see him wherever he and his family is happy, but I think only good things would be in store for him at Kansas. They're a perennial 1 or 2 win team per season which means the challenge is there which would make it fun, but also with decent recruiting, I think everyone knows he's proven himself a coach who can win 9 games.
He could win only half that number of games and still take credit for a "turnaround."
He can leverage the knowledge he's gained from experience (both what worked and what he learned from his mistakes that didn't work) and turn that program right around for the right price.
I think Kansas would be wise to consider the investment and Sexton should consider it for his client as well.
Even if he just used it as an easy way to pad his resume as a stepping stone, it would look mighty impressive to take the reigns of a team who only won 1 game all season and then make them winners who go to bowl games.
It's the best of both worlds even though it might only "seem" to be "beneath him" at first.
But if he's smart, he'll realize there would be no pressure on him like there was at Tennessee should he lose and if he wins on any level above their last few seasons, he would fast become a hero again.
Sexton should negotiate a salary similar to what he made at Tennessee and his standard of living doesn't have to take a hit just because he had an off year his last season at Tennessee.