Unbirth = Soul

So i believe that when death occurs the soul is released and unbirths are created from the soul. Next why are their so many unbirths my answer is the keyblade wars. It seems that they had die so if they did unbirths were created from their souls. This would also give true meaning to the world unbirth. Birth to give life to. To undo birth is death.Unbirth. Lastly it would also relate them to the heartless. To create a heartless the heart must be released if unbirths were the soul released that would show their relation.

I cant figure out why their extinct yet. So tell me what you think.