With the abundance of big men on the Jazz roster, I would pass on Fes. If you want a sixth big man, bring back Elson. At least Elson brings a good work ethic.
But I would have to disagree regarding AK (if you can bring AK back at 3-5 million per year for 3-5 years). AK is a nice component who could easily give you 20-30 minutes a game (while Burke develops). At worst, AK would be a really nice trade chip. Don't throw away an asset for nothing. That is just silly.
You do know that Elson is 40 and was injured all of the last half of the season and completely ineffective?