I dont think Keyonte/Sexton is a good duo and I would want to upgrade Keyonte's starting position and have Keyonte develop as a 6th man (not to ultimately be a 6th man, just not the pressure of starting) and have him as an insurance policy next to Sexton. But at the same time I wouldnt balk at having them both start this year just to see. Maybe the improvement from Hendricks/Collins/Walker/Someone we trade those guys for improves our defense to the point where a bad backcourt can survive defensively as league average.
Maybe Keyonte ultimately becomes a trade chip to get you that star next to Sexton/Lauri. Maybe you get lucky and Sensabaugh/Hendricks/Keyonte/some guy you draft in the future turns into that player.