If we look at this logically, and think, "Who would Sauron most likely put second in command to Old Witchie?" And "Who would old Witchie put as his second?" it would have to be someone weaker than the Witch King, but much stronger than anything else in his armies.
A Nazgūl is beginning to look more likely to me now, as it seems that that would be the obvious choice. Something that both Orcs and men would fear more than anything of their own kind. Orcs and men could easily rise up against a captain who was of their own kind, being the jealous type. And Look at how Sauron (and Melkor) ruled the Orcs, "In fear" keep them in line. One of their own kind would not be able to do this effectively. So, in keeping with Sauron's character, A Nazgūl would be the most likely lieutenant to the Witch King.
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