Fouss does not fit the offense. There is a reason that Davis was encouraged to go elsewhere. KY wants a rim runner at the 5.
Keba is a better defensive player and a better rim runner.
KY will likely find a nice role off the bench for Fouss. Fouss may be needed a lot some games because Keba has a tendency to foul a lot.
Keba was very good for Utah last year - the biggest question mark is whether he can stay out of foul trouble because he couldn’t do that last year.