Would they be the phantom scouts or the sailor theives?
Another thing to dwell on: So we know that Satan's punishment is to re-live his time with Akira (and his subsequent death) over and over again. But its obvious that Satan's empathy and ability to feel emotions develops as he continues to experience these loops. Each time line, Satan understands emotions a little bit better and he becomes a little more human. What does that mean? It means, with each time line, Akira's death gradually becomes more painful to experience. And THAT is true suffering.