True, but Auron is dead. That not only earns him 5000 badass points, but it also means nobody could defeat him, except Yuna. And Yuna wouldn't send her good friend Auron. Therefore, Auron wins.
Technically, Auron has the same properties of a fiend. Unsent spirits turn into fiends, though with Auron, he just still looks the same. And fiends, once you defeat them, turn into pyreflies and Auron would most likely would too.