(This whole thing reeks of Spoilers)

So, who exactly is Shuyin? He has all of Tidus's Overdrives and his likeness soo... Was Lenne one of the trapped Summoners caught in the eternal cycle of summoning, and Tidus is 'based' off her memories of him on some level? Once the summoners were set free in X, does Shuyin crawl out of the farplane or something. But I suppose he only kind of possesses people until he gets to the Farplane... So is he just a bunch of pyreflies that have gone insane. I wonder why he didn't just turn into a fiend though... Oh no, I'm quite confused ^_^ I shouldn't think about it quite so much I guess.