RP-29
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So who is Snoke? Who are the possibilities?
Anakin - his body was burned in a pyre, but his helmet apparently survived, even though we saw it melt in VI. QuiGon figured out how to keep his consciousness post-death, so why couldn’t Anakin have figured out how to create a body to House his consciousness post-death? And Snokes scarring is somewhat consistent with old-Anakin. All that said, I just don’t see it. Too “easy”.
Obi-Wan - as for his body, all the same arguments used for Anakin apply. I don’t see a motive, though. Although, we REALLY don’t know what Snoke is trying to do yet. He may not even be the bad guy.
Palpatine - like Vader, I think this one is too easy. But the scaring COULD match up. And technically, he did get an off-camera death in VI.
Kanan - listed for completeness only. He was never even an actual Knight (well, not until Yoda basically gave him an honorary title). He was just a padwan who survived Order 66. I will be disappointed if they go this route.
Ezra - now THIS could be interesting. He has always been on the fence about which way he would ultimately go, and the final season of Rebels should finish up at about the time VIII is released, so the setup could be there. I am not a huge fan of the character, though, so I hope it isn’t him.
Luke - Hamil has stated that he was not expecting Luke to go in the direction that the movies are taking him. Does that indicate a full heal turn for Luke? It could explain Ben following Snoke. He never left Luke, he has remained loyal to his master at all times. This could also mean a more sinister meaning to Luke’s declaration that the Jedi must end. And it could explain the scene in the trailer of Rey face-to-face with Snoke. That may still take place on the island planet. Right now, I think this is my favorite theory.
Phantasma - I doubt it, but there have been rumors that she is meant for more. I would be shocked, though. I expect her to be revealed as a pretty major face before the end, regardless of the fight scene we got teased with between her and Fin.
Yoda - no way. Just listing him for completeness.
Maz - I don’t see it. Although, she is the one to set Rey on her journey, and it does appear as if Snoke is ultimately after Rey.
Oops...
I forgot one of the more major theories...
Plagueis - I have not read any canon books, so I don’t know a LOT about him outside of the fact that he was Palpatine’s old master and that Palpatine believes he killed him. But Plagueis had presumably figured out how to come back to life after death. At least that was Palpatine’s belief.
One other intriguing theory on Snoke is Mace Windu.