first of srry i dindnt have time to read everything im in a hurry but this struck me a few minutes ago when playing

the dream zanarkand is inside sin you fight against jecht above it, this is also why people can go from the dream zanarkand to the real world through sin. and reverse.

also yu yevon made the dream.(in a way he did)

if your dream would be real where would you keep it .

right, as close as possible right?

teh reason why sin came to dream zanarkand i havent figured out yet but once i got a theory about that ill post it.