I started to look for Darko comps for Keyonte as well, but didn't find anything worth discussing. If you take Keyonte's year in perspective, he started the year ok at a -2, so a little better than expected for a rookie, but then struggled to rookie expectation levels (-3), then he started to make some progress to about a -2 DARKO (similar to Clarkson), but then they started sitting Lauri and everyone and the load was too much for Keyonte and he dropped way down. My guess is if we kept Lauri and Clarkson in the rotation for the whole season and lightened his load a little he would have ended up at -2 or better.
I'm pretty sure If Keyonte is still playing at -3.8 DARKO level next year, that Hardy isn't going to play him the highest minutes on the team. So that's another consideration.