I mean, wasn't Zanarkand destroyed by Sin? If he returned, he'd just be returning to a city of rubble and he'd be seeing the beginning of Sin's long reign of tyranny. People would have been confused and a hell of a lot less calm than they are 1000 years later. I think he probably would have been a lot worse off than he is in Spira. And it's not like he can return to being a big Blitzball star right away, I mean, come on, Zanarkand remained in ruins. I might have missed something in the storyline but this really confused me throughout the game.