Sakuya beig a Lunarian has been a theory that's been around researched for a long time. It's not a big as Maribel = Yukari and Gensokyo is just one giant dream, but it's a relatively popular theory.
The beginning of the thread shows how sakuya would be the last one standing. Well, here's how it would regularly go. I got so choked up by the ending. And yes, I did already posted this on the OOC board for the rp.