Gandalf would Never join Sauron, he would rather have died. If he had joined Sauron attempting to destroy the ring would have been futile because even though Sauron wouldn't suspect it, Gandalf would. And I doubt Aragorn would have become king because he wouldn't take his rightful place until the enemy had been defeated. Also if Gandalf had joined Sauron what would be be? I can just see him saying "Behold I am not Gandalf the Grey/White, I am Gandalf the slightly lighter shade of black!" If
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