Nomura's already confirmed that the soldier with the broken visor is not Sora, or any of the characters we know from the previous kingdom hearts games; the soldier with the broken visor is a completely new character.
What I think you're trying to say, Kingdom-kid, is that Roxas didn't get his heart back all the way, so a "phantom" was created; its so hard to read what you typed, that I really can't be sure, but if i'm right, and that's what you're trying to say, your theory doesn't make sense anyway, because Roxas did get all of his heart back when he rejoined with Sora.