Ok so we know that Roxas can feel, and we know that there are two types of heartless. Type 1: the pureblood, they don't have hearts; cuz the heart doesn't float up after they're defeated. Type 2: the emblem: they have hearts, cuz the heart does float up after they're defeated. The pureblood heartless consist of, Neoshadows, Shadows, bit snipers, etc. Ok so in KH1 at Hollow Bastion, Sora released his heart to save Kairi adn turned into a heartless. But any kinda heartless, he turned into a preblood heartless, one without a heart. His heart had to go somewhere. I think Roxas and/or Namine got their own from his, or they have a piece of a heart from Sora. Any thoughts??