Gandalf is the/a steward of Middle-Earth while valar aren't there (on a way), as Denethor is the steward of Gondor while the king is away. Gandalf's job is just different. He doesn't actually rule ME. So when talking about Gandalf 'steward' means 'envoy' or 'messenger'.
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Like the stars chase the sun, over the glowing hill I will conquer
Blood is running deep, some things never sleep Double Fenris
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