So...Is Dream Zanarkand the Matrix? That seems to be the most logical way I can think of it, a group of people caught in their own reality that can be drawn out when brought into contact with something from the 'real world', in this case Sin.

One thing I'd like to know is any evidence that suggests that Dream Zanarkand is a tangiable place at any point? And also if the Final Aeon is used to create the new Sin, how can Sin be anything more than an extension of this Aeon? Pyreflies binded together by Gravity spells (dunno where THAT one came from exactly) could still be dissapated in theory, much like the Aeons dissapear in a puff of pyreflies. Or maybe I'm just not getting this whole thing about how pyreflies work.