According to the newest info, Ansem divided himself in 3 pieces: heart, body, and soul. When he become a heartless, his heart is Ansem(which is in riku), his body is Diz, and his soul, apperently is, the EM. Well if this true, then the same should go for Sora and Kairi . They both lost thier hearts so they might also have been seperated into 3 parts as well. We all know that the BHK or Roxas is the other side of Sora heart. Or at least thats what we believe. Well he might just be Sora's body. Since they say he doesnt have a heart, he has noth. What about his soul thought? The only person who can be Sora soul is Axel. In COM, Axel didnt want to fight Sora and he also said they have something in common, so it might turn out that he is Sora's soul. Now Kairi. She gave her heart to Sora so he it would be safe in the beginning of Kingdom Hearts. Her body might have become Namine(since she said she was Kairi's shadow) and her soul might have become eaither the sitting unknown in DD or even Elexia. The resaon they havent shown her yet might be because she looks like Kairi. Oh well, i said my two bits, so flame away.