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Sauron would not have needed to keep other captains there as well.
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Why not?
The Ringwraiths were out and about often (as they were when Frodo was moving towards Rivendell). Who, then, would oversee the stronghold?
Sauron appointed a human as Lt. of Barad-dur (the Mouth of Sauron), even though Sauron himself was there.