Originally Posted by bipper
It's because you don't know what is going on. This is very much subtext, and VERY difficult to pick out in FFX. Confusion abroad is for everyone, except for those who have heard it correctly from elsewhere.Yeah, that is what's really getting me. Plot holes?
Tidus is not dead. Unlike Auron (who is an unsent), he is maintained by the fayth at Gagazet. As such, his "existence" is not tied to the pyreflies of the dead, he is contained by other powers. Consider him an Aeon, a small tiny Aeon from a family of Aeons that is essentially one gigantic Aeon.
When at last he disappears, Yuna does not send him. He is disappearing because the fayth are no longer dreaming, allowing them rest. He is also present at Auron's sending without effect. Auron IS an unsent, and would be affected by Yuna's sending.
This brings into discussion, the ability of Summoners to affect pyreflies. It is possible that the pyreflies that constitue an Aeon are somewhat different from the pyreflies of the unsent, that perhaps when they form a material existence, their bonds are stronger (think of it as the difference between a covalent's and an ionic's atomic bond, except without the properties of electron sharing or transfer).
It is also possible that Summoners can only directly manipulate the pyreflies of the unsent, which Summoner school most likely teaches them. While they can manipulate pyreflies of Aeons, they have no direct control over them. In the Temples, one must pray before the pyreflies of the Aeons will even constitute. Also, in FFX, Yuna is seen giving vocal commands (and some battle quotes regarding her Aeons), and this is especially highlighted by her use of the Magus sisters.
However, her bond with Valefor contradicts this (an innate understanding as can be seen in Bevelle), but Valefor is also her first Aeon.
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