Okay let's think about it. So Akatsuki doesn't have any memories of his past. It's obvious that Alpaca knew him or someone related to him in the past. Akatsuki might be the leader of the experiment in the past and somehow something happened to him he became young again and lost his memories, or he wasn't even human to begin with. His calm nature really scares me. Like human can't be that calm in every situation unless something really traumatic happened to them.