By that point, Jecht was Sin, he had asked Auron (who was unsent by then) to watch over Tidus in dream Zanarkand, and wanted to bring Tidus to Spira. That was the cause of the attack at the beginning of the game.
Jecht went from Zanarkand to Spira by swimming out too far and coming into contact with the previous incarnation of Sin while it was still healing, I think?
Dream Zanarkand did still exist after that attack, otherwise Sin wouldn’t have existed throughout the game. That’s why when Sin is defeated before the eternal calm, Tidus also goes to the farplane with the Fayth. Either both exist, or neither exist.
By that point, Jecht was Sin, he had asked Auron (who was unsent by then) to watch over Tidus in dream Zanarkand, and wanted to bring Tidus to Spira. That was the cause of the attack at the beginning of the game.
Jecht went from Zanarkand to Spira by swimming out too far and coming into contact with the previous incarnation of Sin while it was still healing, I think?
Dream Zanarkand did still exist after that attack, otherwise Sin wouldn’t have existed throughout the game. That’s why when Sin is defeated before the eternal calm, Tidus also goes to the farplane with the Fayth. Either both exist, or neither exist.