I see, thanks for the explanations. One last thing:Is Fayth:Aeon 1:1, or can a Fayth dream of many Aeons? If so, then is Tidus technically the Aeon of that Bahamut kid? I looked up the wiki and it said Aeons are some sort of physical manifestations of the Fayth itself.
---
Is it just me or does "Off" work exactly the same as "Default" in X-2 for the dressphere changes? "Short" is the only one that works.
Tidus is being summoned by one of the Fayth in the wall at Gagazet, just like the rest of Zanarkand I'd assume.
Haven't tried off but if it's your first time seeing the transition between two specific dresspheres it will always show the full length one.