It would not have gone against any prophecy for Gandalf to kill the Witch-King. If Eowyn isn't included in "Men", neither is Gandalf.
Gandalf would not have had any problem with all Nine, had he been willing to 'reveal himself in power' or however the Istari line goes. Like I said, it was the chore of the Peoples to deal with this, and Gandalf respected that.
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