It's a weird one. I was thinking yesterday about how weird it is that Caliborn and Calliope have two different dream selves too - this single body with multiple personalities is actually legitimized as two distinct people in Sburb (maybe... I have conspiracy theories about whether this is really the case but they don't 100% add up. But that's a tangent). There is stuff like that, the game powers we discussed in the other thread, and even the First Guardians that don't fully fit Homestuck's usual complex elegance when you look at all the evidence.

I suppose it's entirely possible that the same ectobiology used to make the players is used as some kind of data for Prospit and Derse to create extra stock bodies, but this necessitates even more offscreen unexplained time travel, and runs into some of the same problems as the players' powers do when it comes to non-ectobiological players like the cherubs.