Den ena ringen gav Sauron kontroll över de nio, men när den togs från honom hade han fortfarande makten att kontrollera dem (eller åtminstone han återfått den i slutet av tredje åldern). Varför är detta? Wikipediaartikeln nämner att han drog de nio till honom, men inte hur.
Efter att de nio ringarna hade blivit Ringwraiths, tog Sauron - som vid den tiden fortfarande hade One Ring - sina ringar från dem. I ett brev skrev professor Tolkien
Sauron ... still through their nine rings (which he held) had primary control of their wills.
från Brev av J. R. R. Tolkien ; betona min.
Sauron behöll fortfarande kontroll över Nazgûl genom de nio ringarna som han återhämtade sig medan han fortfarande var i kontroll över den ena.
Brev # 246 förklarar att även om någon annan hade kontroll över One Ring, skulle Nazgûl ändå slutligen lyda Sauron:
Sauron sent at once the Ringwraiths. They were naturally fully instructed, and in no way deceived as to the real lordship of the Ring...But the situation was now different to that under Weathertop, where Frodo acted merely in fear and wished only to use (in vain) the Ring's subsidiary power of conferring invisibility. He had grown since then. Would they have been immune from its power if he claimed it as an instrument of command and domination? Not wholly. I do not think they could have attacked him with violence, nor laid hold upon him or taken him captive; they would have obeyed or feigned to obey any minor command of his that did not interfere with their errand - laid upon them by Sauron, who still through their nine rings (which he held) had primary control of their wills..
Från oavslutade taler "Hunt for the Ring":
At length Sauron resolved that no others would serve him in this case but his mightiest servants, the Ringwraiths, who had no will but his own, being each utterly subservient to the ring that had enslaved him, which Sauron held.
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