Maybe this has been explored before, so forgive if I bring it up again, but what are the odds of Snoke being Plagueis? I threw this around for fun the other day, but I found similar theories on the web, being supported by Snoke's theme on the soundtrack being similar to the background music when Palpatine is talking to Anakin about Plagueis in Revenge of the Sith.
the odds aren't too bad. It'd be a good fit.
It'd be a direct reference to Prequel canon, though. But they didn't shy away from making a reference to using clone troopers, so they're not all hardcore "can't touch any of the PT lore, even though it's officially canon"
Wasn't Plaegueis the one who could 'cheat death'?
The scars on his face could be the wounds of an attempted (and kinda succesful) murder by his apprentice.