I can see both sides of the argument have facts. The for Gothmog being Nazgul side has this as evindence.
That Minas Morgul was taken over by the Nazgul and where the abode. Never would have Sauron placed an orc as second in command for such a fortress. Only in lesser towers such as Cirith Ungol did that happen, and even then after Sam and Frodo "visited" the place and all the orcs died a Nazgul took charge of the tower. Also Black Numenoreans were rare at that point in middle earth for the only one spoken of is the mouth of Sauron who has no name.
On the other hand the Gothmog not being Nazgul side is.
As said before the Nazgul were out much, expecially when it came to having tea time with hobbits....Wait.......Never mind. Also the fact that the mouth of Sauron thought that it was greatly possible that he would be put in command of Isengaurd after the disposal of Saruman, why shouldn't another man be put in that position of Minas Morgul. But the problem is Tolkien never stated what it was.
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Instead of pepper spray, you pack a glass bottle and scream "Aiya Earendil Elenion Ancalima!!!" at muggers.
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