I genuinely believe that Kokichi and Kaito can understand each other, get along and become really close. But it will take a lot of time, especially since Ouma is very bad at taking genuine kindness. And also is on edge, because all of the consequenses of his actions have caught up to him simultaniously. What's even worse, the people who are supposted to hate him the most are being nice to him, and he can't handle that right now.
I've seen the ch4 closing argument tons of times but I just now realized:
Miu is drawn as a silhouette right before she was going to kill Kokichi with the hammer, but then in full colour when Gonta begins strangling her. She's depicted as the Blackened until Gonta forcibly changes the course of the story and her role in it.