If healthy, JO HAS to be the center finishing games. He is better than Perkins. Defensively, he is more than capable of filling Perk's role. He just needs to get comfortable. The more PT the better. He may not be as good a rebounder, but he is a pretty good one. He is a significantly better shot-blocker. Offensively, it's no contest.
I'd be shocked if Doc doesn't go to him to close out in the playoffs.