The Nazgul would be in line before some man-turned-sorceror. The WItch-King was in charge of Minas Morgul; Khamul was in charge of Dol Guldur. The Mouth of Sauron was simply Sauron's Lt. at Barad-dur, and I can't see him leaving and being given his own fortress to reign over the much more active and powerful Nazgul. It doesn't make sense.
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...take counsel with thyself, and remember who and what thou art.
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