Well, this is possibly true, but in the KH3 spec thread, someone said that there's a part in the extended version of "Another Side, Another Story" (Or whatever is at the end of KH1 special ending. Or maybe for FM, anyway, you get my drift.) that right near each other, in japanese, text is on the screen that says "Heartless, Nobody, Endless". This could mean that it meant those two creatures would be coming endlessly, but I agree with him, it seems odd they would put just those words together like that, and not have a creature named endless.