Wow, nice post. I'll give it my way xD

Okay, in that one international ending of FFX or whatever, Rikku shows Yuna a sphere of someone that looks similar to Tidus (I saw it on the internet. Believe me, its either him or Shuyin looking a lot like a Tidus clone. Aaah the cloneyness). So she thinks he's alive so she sets off to go look for Tidus.

When she falls into the Farplane after defeating Ixion and meeting Shuyin, she sees the ghost of Tidus, which would probably tell you he's dead. Okay, after he comes and saves her, she ends up in Bevelle.

Okay, now after you defeated Shuyin, you go back to the Farplane Abyss and only 2 things can happen.

1. Yuna walks around and hears Tidus whistling. Then the Bahumut/Zanarkand fayth asks that you heard the whistling and do you want to see him again. You can say yes, which can will bring you the Good/Perfect Ending. Or no, which will only bring you the regular ending, aka big old speech about how New Yevon and the Youth League combine as one. Blah.

2. Yuna comes out to the farplane and hears whistling. She stops, and the ghost of Tidus comes and hugs her. Then she tells him her undying love for him and how he was there the whole time and he dissappears. I have witnessed this ending, by playing my cousins game, so...yeah. Is something different with those Greatest Hits games?

Okay, so when Event 1 happens and lets say you have 100% You'll see that he came from pyreflies to human again, then came out of the water and he swims and blah. And Yuna says he's back and Tidus says he's finally in a place can call home. Whoo hoo, go him.

At the perfect ending after that, he gives his theroy on how he came back. "I guess the fayth reconstucted my thoughts and brought me back that way or something, I guess." Or something like that.

I hope this helps ^_^

Oh yeah, for that one dude who said he came back from Zanarkand and he traveled 1000 years into the future and stuff, that's from FFX. Tidus and Auron traveled 1000 years into the future thanks to Sin aka Jecht. Neither Jecht nor Auron came back to life. Not even Braska. By the way, I really didn't understand your post anyway xD