I don't think the cap space would allow for KP, JB, KI, and KD, but they might be able to add JB and KI to KP, which is still formidable. KI could also cause an issue with Frank Ntilikina who didn't have a bad rookie year and he was taken 8th overall.
Maybe, since JB and KI want to play together, we can trade KI for KAT?