O livro deixa bem claro que o Um Anel pode controlar os portadores dos anéis menores. Também sabemos que Sauron havia recapturado pelo menos um dos sete anéis de anões, presumivelmente para usar a si mesmo, não para colocar em um museu. Os Espectros do Anel definitivamente usavam seus anéis. O portador do Um Anel poderia usar esses fatos para sua vantagem?
Se você possuísse o Um Anel de Sauron e o reivindicasse como seu, dependendo da sua quantidade nativa de poder, uma de duas coisas aconteceria:
Você enfrentaria Sauron e seria destruído
[A] confrontation between Frodo and Sauron would soon have taken place, if the Ring was intact. Its result was inevitable, Frodo would have been utterly overthrown: crushed to dust, or preserved in torment as a gibbering slave. Sauron would not have feared the Ring! It was his own and under his will. Even from afar he had an effect upon it, to make it work for its return to himself. In his actual presence none but very few of equal stature could have hoped to withhold it from him. Of 'mortals' no one, not even Aragorn.
The Letters of J.R.R. Tolkien 246: To Mrs. Eileen Elgar (draft). September 1963
Si poder reduzir Sauron a um espírito impotente
Confrontation of Sauron alone, unaided, self to self was not contemplated. One can imagine the scene in which Gandalf, say, was placed in such a position. It would be a delicate balance. On one side the true allegiance of the Ring to Sauron; on the other superior strength because Sauron was not actually in possession, and perhaps also because he was weakened by long corruption and expenditure of will in dominating inferiors. If Gandalf proved the victor, the result would have been for Sauron the same as the destruction of the Ring; for him it would have been destroyed, taken from him for ever.
The Letters of J.R.R. Tolkien 246: To Mrs. Eileen Elgar (draft). September 1963
Não há evidências que sugiram que você seria capaz de comandar Sauron da mesma maneira que Sauron comanda os Nove.
Da mesma forma, embora você possa ter alguma proteção contra os Nove, você não seria capaz de comandá-los, exceto possivelmente com instruções secundárias:
Sauron sent at once the Ringwraiths. They were naturally fully instructed, and in no way deceived as to the real lordship of the Ring. The wearer would not be invisible to them, but the reverse; and the more vulnerable to their weapons. 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 commands 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.
The Letters of J.R.R. Tolkien 246: To Mrs. Eileen Elgar (draft). September 1963
Embora este seja um exemplo um tanto imperfeito, já que Frodo é mencionado explicitamente como não tendo força para comandar vontades hostis; um portador mais poderoso pode ou não ter melhor sorte.
Se você quisesse comandar os Nove, seria muito melhor tentar roubar seus anéis de Sauron1; é claro, se você conseguiu fazer isso, provavelmente já dominou o Um e derrotou Sauron com ele, e se tornou o recém-ungido Lorde das Trevas de Todos.
1 A pergunta afirma que os Nazgûl "definitivamente usavam anéis", mas eu não seria be como definitivo; o balanço de evidências sugere que Sauron realizou os nove