Quote Originally Posted by Jiro View Post
Yeah, if the fayth were the only thing keeping Jecht alive, and their purpose was to defeat Sin, then surely stopping their dreaming at any point would've been fine.
A fayth CAN'T choose to stop being summoned. They granted the summoner their power, and ever since then that summoner can call forth their aeon.

Bahamut's fayth asks Tidus to "let them rest, because they were tired of dreaming", remember? This very much implies they cannot simply do it themselves.

@Crop: We don't know if Jecht was the only one. The Order of Yevon has "Sin's Toxin" as a convenient excuse if anyone said they came from Zanarkand.

There's no problem with a dream of the fayth becoming a fayth themselves. Aeons are just as physically existent as anyone else, just as real as anyone else, the only (main) difference is that their existence fades when the summoning stops.

As for why Sin attacked Dream Zanarkand, the most common theory I've heard is that Jecht had enough control over Sin to make it go near it, which it generally isn't supposed to. That's when Sin's instinct to destroy machina cities came into play, and things went their course.