Kingdom Hearts II The prodiction

In the Ansem reports on kh 2 (can't remember exsacly which one) I found a quote which I thought was a prediction of the BBS game, see what you think: "The body is made up of three things The heart, The Body and The Spirit.When the spirit leaves, the body dies, but what happens when the heart leaves? the body developes a will of its own...." the rest I can't remember but it mentions three parts to a person and at the point of kh2 only 2 enemies exsisted so I thought the spirit maybe the next to come.

 

I don't remember this being a part to the Ansem Reports, but if it was, there is already a conformation for "unbirths" in one of the new KH games (can't remember which one at the moment), though we don't know what they look like, as far as I know. That would probably be what happens when the spirit leaves the body. Heartless are what occur when the heart leaves the body, and Nobodies are what is left, so that would be the assumed answer.

 

No, without a spirit you're dead.
Heart=emotions.
Body=vessel.
Spirit=life.
The heart leaves the body and gets shrouded into Darkness, it becomes a Heartless.
Usually the body and soul will just fade away.
If the person's strong willed, the body is reborn in the Realm of In Between and the soul gives it life without the heart and it becomes a Nobody.
So all three parts are taken.
Without a soul, you'd be dead.
The only thing that could be left is a mixture of heart and soul, but that seems unlikely.
The Unversed

Spoiler

are negative emotions literally brought to life by Vanitas or something like that

 

The soul is only the battery of life. It's the powerhouse of a being. If this is gone or taken away it is basically death. Now it's possible a creature could be born from this, but the series as a whole is more focused on hearts than souls. Hearts are the central focus and and they would have to find away to bring hearts into the mix of the soul creatures creation.