OK, so I'm really confused right now because I still don't really know the purpose of this "new Oragnization XIII"-thing...

 

Further I would like to know whether the ending of DDD takes place in the real world or in the Realm of Sleep? And when it takes place in the Realm of Sleep then how is it even possible for all the Norts, Braig, Isa, Lea and Micky to be there?

 

Finally I wanted to ask how it is possible for Master Xehanort and Terra-Xehanort to co-exist? I mean MX is Terranort!

 

Thank you for answering my questions!

The 13 seekers of darkness was a plan constructed by MX so that he could have a Keyblade War, with the seven lights, summon the X-Blade and thus use it to take control of Kingdom Hearts.

The ending where they're in the World That Never Was is in the Realm of Sleep. Isa and Mickey both travelled into the realm of sleep, going after Sora and Riku. Braig, Isa and the other seekers were already there from the start, waiting. They entered through Master Xehanort's powers and he must have somehow found a way to allow the different parts of him to co-exist somehow. I'm not sure how, maybe once we get better translations we'll know, but not right now.

Ansem SoD gave Young Xehanort from alternate timeline an gift to time travel, so he can help Master Xehanort to fullfil his future task.

Whole new organisation was created so Xehanort can make them all to his vessels, possibly to take control of them and give them able to wield keyblade.

I agree with Keyblade King 12s opinion with anything else.

I don't know whether it is only me, but it would kind of bother me if Terra-Xehanort was just a plain member of the new Organizazion XIII...

 

This would make the ending of BBS so much less dramatic and tragic.

Its possible that Terra has returned into Radiant Garden due destruction of Ansem and Xemnas.

i think that heart of terra was separed of xehanort due the destruction of Ansem and Xemnas

If that was the case then BBS would be kind of senseless.

Well, the whole Eraqus-protecting-Terra thing is going to tick me off if Xehanort eventually consumed Terra's heart anyway.

Well Master Xehanort said Sora and the last one(by that he means Terra) were on his side. But the Lea goes in beast mode and saves Sora. Terra is still on Xehanorts side though, but he is probably a vessel, not controlling himself. I am not too sure how Terra will be saved. Maybe his heart has been reformed due to the destruction of Ansem SoD and Xemnas.