Sauron thought the Ring was in Minas Tirith, and he was going all out in his assault. The Witch-King was there, and it's more than reasonable to assume at least a few more of the Nazgul were present. Where else would they have been? If the Lieutenant of Minas Morgul took over for The Witch-King, he was also the Lieutenant of the Ringwraiths. I think it's unlikely that a plain old living Man filled that position.
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