In the book at least, Gandalf as the White has been given by his superiors in Valinor all the "authority" that previously had been Saruman's. Gandalf was then made the ultimate commander-in-chief of the war against Sauron, and that was recognized by Aragorn, Galadriel, Théoden, and all the allies of the West (excepting Denethor), whereas before he was just an "adviser".
I think the handover of power was made "official" when Gandalf informed Saruman he no longer had a color, and broke Saruman's staff.
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Music alone proves the existence of God.
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