PRE CHAIN OF MEMORIES: I thought that Sora shared his heart with "BHK". Since I heard somewhere "The Other Side of the Heart"
Duel Weilding Unknwon was BHK (At first I thought it was Sora, but when he asked "Where's Sora", I began to think that this guy must be a part of Sora, because he could weild Oathkeeper and Oblivion, but isn't really him. Thus the "BHK") I was dead on =P
Sitting-On-The-Rock was Kairi. Seriously! Sitting on the Rock had very femmy lips!
Oh, and I believed that Diz wanted revenge on Sora, because Diz was Ansem, and Sora had defeated him. I strongly believed that Diz=Ansem.
AFTER CHAIN OF MEMORIES: Diz must be this weird good guy aiding Riku...for some reason.
BHK, now "Roxas", was still the other side of Sora's Heart, the darkness.
The Organization was being led by Ansem.