The thing is that I really don't get that whole thing that Ven sleeps within Sora and how does Sora have no memory of what he experianced in his childhood? ZDoes this play out in the whole chain of memories game????

No. It's not the CoM game. It's just because it's 10 years later. Remembering someone 10 years ago would be very hard. That's why Sora doesn't remember Ventus. He doesn't also remember Terra and Aqua, and nor does Riku.

I hardly remember anything from 10 years ago, so I doubt Sora the Idiot will remember that far back. ever (unless somehow Namine reached in his memory and brought those memories forward in his mind)

THATS RIGHT! Namine was re-connecting Sora's memories in 358/2. She had to have seen Sora's memories from then right?

if she reconected all of sora's memories then she should have seen everything sora went trhough but y didn't she told anybody or maybe she told ansem o and 1 question how did the organization new roxas was ven , remember saix said

I think upon seeing Aqua, Sora and/or Riku might just vaguely remember her, but not be able to put their finger on it, as the term goes.

 

Though I think it would be interesting if Aqua saw Sora, thought he was Vanitas, and attacked him, then they start fighting, and Mickey comes out and says "Aqua! Sora! Knock it off!" or something like that, and Aqua remembers him. Seems plausible.