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As far as I know, Gandalf was went back by the Valar to finish his job in uniting Middle Earth and leading the united races to victory over Sauron.
Saruman changed his own colours didn't he? He believed that multicolours showed more power, because it shows his apparent mastery of all.
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I go to my fathers. And even in their mighty company I shall not now be ashamed. I felled the black serpent. A grim morn, and a glad day, and a golden sunset!
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