Extensions is how they start out. As it goes they turn into Xehanort more and more. Xigbar also proclaims proudly in DDD that he is already "half-Xehanort" so exactly how much is his own self obeying at the present time is debatable.
That's not really something we can claim when half of the new Organization is unknown and the half that is known is already part Xehanort in some way so obeying isn't a choice. Ansem is his very heart, Xemnas is his nobody, young Xehanort is himself, Xigbar is already half Xehaonrt, etc.
Isa is also iffy territory since we don't know whats happened between his sarcastic self in BBS to his almost robotic self in DDD.
Well with the whole sharing thing I found that here: Gram's Corner Find the post that says Roxas Keyblades. The person that runs that tumblr uses nothing but translations from this very site. What they posted says Roxas and Sora shared but apparently that's all that's ever been stated on it. But in a universe full of disney magic I suppose them sharing just cause isn't to strange.
I always took Sora and Roxas fight as a metaphysical thing. Roxas appears and the next thing Sora knows he's in his station fighting. The station has always been used as a metaphysical place and represents the heart. Plus Donald & Goofy say Sora disappeared entirely.
So if the station represents the heart and if they are fighting within that station then I take it as metaphysical battle of wills mumbo jumbo were anything can basically happen.
That's what I mean by them all sharing Xehanorts. If Roxas can share Soras then whats to stop Xehanort's keyblade from spreading to each of his own vessels? He is turning them into himself after all. Times Xehanort by 13 and you now have a keyblade and heart spread 13 ways.
I think of it from a different angle. Think of it like this. Xehanort has spread himself 13 ways right? That's 13 wills, hearts and bodies he has overtaken and still maintained his own mind and dominance. You don't get much stronger of heart than that.
Thats not how that works. The vessels aren't 13 separate hearts waiting for keyblades they are 13 versions of the same heart. Xehanort's one heart isn't going to be chosen for more keyblades when he already has one. Even Riku didn't get a new one till Sora stole his permanently.
You thinking of the 13 as individuals when Xehanort is openly stripping them of their individuality. It's not 13 different people but 13 of the same person.
I find it cheating too. I don't see how Xehanorts heart can count for 13 pieces. Unless it's some overly complicated crap like represent the already existing pieces or something. It never really said were the Xblade parts went when it shattered. They could be floating around for all we know waiting for people to represent them.
It's plausible for them to use a keyblade but using one and having one of your own is different things entirely. Young Xehanort uses Master Xehanorts apparently but hasn't gained it himself yet, Riku used Oblivion against Roxas even though he didn't have Way to Dawn yet, Ansem used the keyblade of heart in KH1 even though Riku says he lost his own in DDD, etc.
The entire set up is silly. Xehanort's heart counts for 13 even though they're all basically him? Sora and Roxas both use Kingdom Key? Axel getting a keyblade because basically fanservice? Kairi's keyblade in KH2 never being explained? Nobodies can't feel but oh wait they do? Time Travel?
The entire thing is silly. Has been for a long time now.
We already have a case of keyblades being shared and of Xehanort taking control so there more inclination towards that direction than the Xehanorts getting their own when they aren't even themselves right now.
Then there is time travel. We don't even know how many of the Xehanorts are from the past and how many is from the future. To me it would be even sillier to give them all their own individual keyblades just for them to go back to their times at the end of KH3 and lose that little character development.
But do a repeat of Xehanort taking control of their minds like young Xehanort in DDD and now you have options for neat/fun second stage battles were Xehanort empowers his vessel with mojo and keyblade.