Sora, before walking the other way: I’m in hell, aren’t I? In no perfect world, you’d be in the afterlife. You deserve to be in the Realm of Darkness, that same darkness you ranted about for years. You let that darkness in long ago. Enjoy it alone. I pay for my actions, and you get a free pass for yours. There aren't rules for you and not others. You don’t get to get a free-for-all of that death and pain you caused. I had to clean up your crap, and I get to see your sorry ass again. I’m going to go the other way and pretend I didn’t see you. 13 versions of you are enough; a 14th version of you shows up, and you're so pathetic you have to hide behind backup copies. 

(For those saying Sora would be friends with Xehanort, I would say nope. The way he looks at Xehanort speaks volumes, and that was for a few seconds. Xehanort is why Sora had to do what he did, and he's seeing the man responsible for his predicament and the same monster he had to clean up after. He knows all versions of the man aren't to be trusted, so why Sora isn't smiling is simple: why smile at the man responsible for why you’re there in the first place? He’s seeing his friends and his girlfriend's murderer.)

Oh, Dan Heng openly expressing his feelings for Stelle... hmm

Imagine the theory of this being Ava being true. Yes, she has darkness because of what the Master of Masters did to his own students, making them vessels of 7 ancient darknesses against their will, which could be why she attacked Luxu, whom he knew and didn't bother to warn any of them. How would you react if you heard your own master had made you and your colleagues vessels for darkness? You wouldn't take it well. She did what the other foretellers didn’t; she chose the black coat, and she does have a second role after all. That second role is Sora-related. I see others see it being Invi. I would say no, she's still there with Luxu and the others, he is explaining events to them, he's dealing with his colleagues, who, the last time they saw each other, tried to off each other.

We can imply that's what Luxu told her, just as the Master of Masters told Ava her second role, a role, mind you, we don't get to hear. 

Ava, being the easiest to approach, is evident in Khux.

Unlike Ira, Aced, Invi, and Gula, only she and Luxu completed their original roles while the four foretellers failed theirs. 

Oh, look, Childe mentioned from the recent quest.

Childe, upon seeing Lumine: Fight me.

Ava: Sure, you’ve dealt with 13 versions, and a 14th shows up, why not?

Luxu: Yes, punch him 14 times.

The Master of Masters sitting in a chair above watching…