I warned of possible spoilers, but I guess I'll black all this out anyway just to be safe.
I guess I've always been a bit confused about that whole timeline and the creation of Sin, no matter how many times I've beaten the game!
Alright, so I was thinking about how Yunalesca creates the aeon for the Final Summonings. Well, who creates the other aeons, that all summoners can call? Were these all created from Yu Yevon in the Zanarkand of the past? Or, are some of the aeons made from more recent people in the time of the Yevon religion as Spira knows it? I was reading a thread about Anima, if she was a Final Summon or not, and the question was because of the scene from the past that we see in Zanarkand, just before she is made into an aeon. Either way, it got me wondering who actually creates the aeons.
Also, where did Yunalesca get the power to create the Final Summoning? Wasn't Lord Zaon her Final Summon, the very first one? So did she create him, or was that possibly Yu Yevon's creation, or what? Or did Zaon become the first aeon to complete Sin?
Also, where did Yunalesca get the power to create the Final Summoning? Wasn't Lord Zaon her Final Summon, the very first one? So did she create him, or was that possibly Yu Yevon's creation, or what? Or did Zaon become the first aeon to complete Sin?

I guess I've always been a bit confused about that whole timeline and the creation of Sin, no matter how many times I've beaten the game!