Kingdom Hearts II Worlds have hearts, does that mean that have heartless and nobodies?

So far we have two examples of worlds that have lost their heart/body and that is End of World and TWTNW (I think) normal worlds like Destiny islands that were destroyed...do they have nobody and heartless worlds too? So what DI came back, I dont think that means that the nobody world of DI and the heartless one were automatically sucked into it again. I kind of think they're still out there. Thoughts? More importantly, is this just another plot hole...?