I mentioned the idea a while back, and I know another forum did just a few pages ago, so I personally don't think it's out of the question that the Sixth might be impersonating one of the Foretllers, personally

Especially since we now know of Ava's illusion powers--that the others might have--that would make such a thing easy.
...
So, I'm trying to figure out if the names and sins work with the characters going off of the Rebirth theory.
I can't really see Kairi as greedy, honestly, unless we count her wanting to go with Sora and Riku, even though that may not be the best idea for everyone else's sake? Perhaps Naminé could count as Kairi here, for what she did to Sora in trying to bring his heart closer to her in CoM? I know that that was the Organization's fault, but still.
The only time I can imagine Aqua as envious is with her line, "The friendship between boys... it almost makes me jealous", but do you guys think that's enough?
Perhaps Ventus is gluttonous for trying to make some new friends in BbS, and somewhat trying to replace his old ones when things got bad between them? Vanitas' affinity for darkness--or even how he at first wanted the light to save him in the BbS novel, if that's at all true--could also count.
We've definitely seen Riku be wrathful towards people who've threatened his friends before, yep. That's probably the one that fits one of our current heroes the best, actually.
As for Terra being sloth... That's the one I see the least. Unless we just point out him being slow at running? LOL. Or moreover, that he's somewhat slow to figure things out and often got tricked that way?
IDK. What do you guys think?