Bear in mind Ditto, even if we accept that Voldemort is strong willed enough to resists the most harmful effects of the Nazgul's magic, the fact that he death eaters can't will destroy him. If his death eaters made one mistake in this hit and run tatics, they are screwed. They will make mistakes with the nazgul flying around. If they make a mistake or even pause, the WK will snap their wand. Once snapped, they will be ether killed or captured. If Sauron can convince at least half a dozen death eaters to work for him, he can effectivlly counter any direct voldemort attack, the death eaters and dementors will hold him off, he will finish Voldemort
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