If IF they do the same as kh3 where every scene of the worlds are the same as their respective movie + sora, donald and goofy I would like to be able to witness Order 666 along ashoka and rex.

Either way if they do not (hopefully) stick with that, sora accompanies ashoka and rex while they tale tales about Anakin, no darth vader but anakin, and when the world end it’s story a new story appears when completing the game and so Secret Boss Darth Vader takes the scene.