So Palamedes found a way to bring his soul back from wheverver the hell it went after that explosion, realized there wasn't enough room in what was left of his body and decided to possess Camilla instead. Yeah, that's exactly the kind of insane stunt his friend would pull.

"So after Canaan House, you decided to rebel against the Empire," he observes. Natsuno couldn't care less about space politics, but it's important to figure out where he stands in this strange new universe. "And these Blood of Eden guys think it's just Camilla. How are you gonna explain me? I'm not a necromancer, but I'm not exactly normal."