I think villainy makes all the difference- not in the power to re-embody himself, but in whether his spirit would be admitted to Valinor where the Valar would restore his previous status.
Gandalf isn't an especially helpful example because Eru intervened and short-circuited matters
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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