Only the SARs, as are the Ansem Reports, seem to be written in a chronological order. If new information was presented, he simply wrote in his new foundings without touching the old ones. Hence why I say that Namine coming from Sora's Body and Soul doesn't contradict anything from what was said earlier, aside from her coming from Kairi. She's still an unknown being, otherwise why not change that as well?
You rather supported my idea that Ven had to do with her looks.
Which is basically what I was saying, and that Sora didn't really give anything save for the strength of Heart that initiated the process, hence ensuring that whatever came out would be human shaped.
I never said the Unverse themselves evolved into Heartless, perish the thought. The process to create the beings is what evolved, rather than the beings themselves.
Not really. Namine is an outside faction. Her fusing with Kairi to begin with, going by what you're saying, would indicate Kairi had something missing, but alas, if Namine had anything to her, she would have had to fuse with Sora too since he's the one she came from, while Kairi had her Heart, Body, Soul, and until said otherwise - Memories.
Namine as far as Diz describes her, Nobody or not, is nothing more than a sense of self held together from basically nothing. Kairi's interference with the birth of a Nobody that already came from both her and Sora's Hearts would merit a by-product, imo, and much like how it is now, Namine'd take nothing from either Sora or Kairi, leaving Roxas just fine and dandy and her disposable in Diz's eyes.
Namine's tied to CO, and CO is tied to BBS. Namine is already tied to BBS by definition, which works nicely with Nomura saying to take Sora not thanking her as a hint. We already have unfinished business with her, so we're liable to see her again.