You guys are prasing Auron for something that Tidus changed more than anyone.
When everyone knew Yuna was ging to die so Tidus was the one looking for a way to make her live. i believe that if auron wasn't there they still would have fought and beat yunalesca. But if Tidus wasn't there I believe yuna would have no shining light to rely on and given in and made a final aeon.

Ok so lets go back to macalania the kiss. That gave her strength to go on. Auron did nothing that i remember that would give her a whole lot of strength. I remember Auron saying "This is your story, and you decide how it develops" I remember Tidus taking it a step further. By making it known that he wouldn't let any harm come to yuna. I just don't see how he did more than make them feel the sorrow to its fullest only so they would fight back in the end.