Yeah, Auron seems quite pragmatic and cynical "after his death". He seemed much more like a loyal warrior monk when he was Braska's guardian. But it was ten years from Braska defeating Sin to he showed up with Tidus. What did he do all that time? Where was he? I know he looked after Tidus, but he wasn't in DZ all the time. Maybe he found out more about the nature of Sin and Yu Yevon in those years?