So, it's officially coincidence that all canon Time players have been Derse Dreamers, and that all canon Space players have been Prospit Dreamers. But do you suppose it might be a requirement that the Time and Space players be from opposite moons? Like, if a session did have a Prospitian Time player, do you suppose it would necessarily also have a Dersite Space player?

That’s an interesting theory. It could be a requirement, I don’t think we’ve been given enough evidence to say either way.