ok this might work

[moos]

when a person dies its being is split in 2 heart (turns into heartless) and body + soul (nobody who remembers his past) but because roxas and namine cant remember there past could there soul be somewhere else (i saw in the secret movie the word endless with heartless and nobody so ill go with that name) could they be the soilders in the next game.
and before you denie it
if sora got his soul back (memories) how did he get his body back without roxas
and riku probably died when xehanorts heartless took over him so his nobdy came but he came back and so his sole wondered off.
theres probably something wrong with this and some guys going to yell but comment away

[swizzle]

i really dont get ur question at all. not meaning to bash, but it doesnt make sense to me.

[The betwixt mind]

When a person dies thats when their soul leaves them. When the heart leaves a person they become a heartless with a heart they cant even use because of they are darkness. The body and soul are the shell that makes up a nobody. In the Ansem reports Ansem the Wise isnt even sure if Namine and Roxas are nobodies since they "lack the requirements of becoming one." This all happened because Kairi's heart was within Sora's. Then there was the fact that Sora was a heartless for a short time, which is why Roxas had no memory of being Sora. Instead Namine had Sora's memory but looked like Kairi. Umm... I should have just told you to read the Ansem reports. My bad.