When the messenger from Sauron came to the Dwarves wasn't one of the things he promsied them that they shoud have the three Dwarven rings again if they joined Sauron and helped Sauron find Bilbo and the One Ring? Assuming that Sauron was being in his own twisted way, sincere in this offer (And why wouldn't he be, if he held the one ring he would WANT the Dwaven rings on Dwarven fingers (at least for a while), doing thier mischief) that seems to imply that Sauron had the three rings avalaible to give, which they wouln't be if he had handed them out to three more men to make three more Nazgul. I can imagine the Mouth and two other men (maybe one great king each of Near and Far Harad, to make sure that the leader of each nation would ever be loyal to Him) but this would seem to be a later idea that would require that he abandon any plans of ensaring the Dwarven Kingdoms with them.
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