Quote Originally Posted by fire_of_avalon View Post
But there's a problem. We find out that Sin actually does have weaknesses, it can be beaten it can die. So Yunalesca comes up with this plan to feed it more Aeons, allowing it to merge with them and keep on punishing the world for it's dastardly ways.

Meanwhile, Dream Zanarkand still exists to perpetuate what the Summoners wanted to have and power Sin around the world so it can kill stuff in between feedings. Remember there's no machina in DZ. And also no of whatever they called Rikku's people. Can't remember. The Zanarkanadians... They a bunch of racists.

Unfortunately they call one of their big gun Fayth's out (Jecht) to feed to Sin. He still has a heart, he tells Auron stories about his son and they all figure out what's going on. Auron is pissed as hell, tries to kill Yunalesca so she can't make anymore people go on this stupid journey but he dies in the process. However, he's such a badass that he makes himself his own Fayth, his own Aeon, and crosses over to Dream Zanarkand to find the only entity he figures can reach out to JechtSin - his son Tidus.
It is not known if Yunalesca approved of her father's intentions or means. I do not believe that she was present in Zanarkand at all during the war (for some reason, I am remembering her abode as being in Bevelle, but I could be wrong). However, what is known is that over the course of her many years after the Final Aeon cycle, she eventually came up with the knowledge that people are idiots, and that they are best contained. I've got a long theory about how much death screws with your perceptions in FFX. The Fayth that operate DZ are generally benevolent. There were no Al Bhed probably because they as an ethnic peoples did not exist yet.

Jecht's journey to the real Spira was entirely by accident, as he got sucked up by Sin after swimming too far out one day. Tidus' venture into Spira was entirely by design. Auron didn't become an Aeon, he just plain went off and died (this leads to him finding a younger Kimahri, and telling him about Yuna, which is part of the reason why she went from Bevelle to Besaid). Normally, dead people stick around long enough either to become fiends, or to go to the Farplane, but Auron didn't do either (there are cases of people doing neither, as long as there is a good reason for it), and was part of Jecht's grand orchestration.

Aeons, entities that are made out of Pyreflies (they also constitute dead people, fiends, and other natural phenomena), are independent beings that answer to whoever it is that they deem worthy. Jecht is effectively at the center of a big giant plothax, but he an Auron are more or less in cahoots throughout the entire game. DZ is one big giant Aeon, and the statues in Gagazet are the Fayth, while Yu Yevon is the Summoner. Pyreflies are at the center of everything.

As for the Fayth in FFX, the particular statues employed and found throughout the game most likely are the implements of the Yevon religion (Valefor, Ifrit, Ixion, Shiva, Bahamut, and Yojimbo), but Aeons themselves have existed beforehand and were secular beings; the ones in FFX fade away at the end because the primary (i.e., Fayth-independent) method to Summoning has been lost. Otherwise, the Zanarkand summoners would have had no use of them. Examples, such as Anima, has her own Fayth, but by no means was she a creation of the Yevon Clergy (it is more likely that she is Seymour's version of the Final Aeon). As for the Magus Sisters, we have no idea where they come from. They're just there.

In some ways, FFX-2 helps to clear this up, as Aeons can continue to exist (albeit slightly nuts), and in other ways, it screws it up.