:::It would still not make that much sense since unlike Vader Maul was still a villain after he "died" and I see little reason why Anakin would decided to come back under his evil Darth Vader Persona. Also in Return of the Jedi Anakin's ghost appears meaning that Lucas clearly meant for him to be dead. As mentioned earlier I can't see Disney being dumb enough to make a change to the official canon of that magnitude. Seriously, the only way I can see this being even remotely plausible would be if a new villain decided to take on the mantle of Darth Vader trying to gain prestige, like the way Jason Macendale tried to take over as the Hobgoblin.