Your point regarding Sauron being big and scary does not indicate that he inspires the same fear as the Nazgul do.
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Tolkien is not explicitly stating that the Mouth would be that lt. at Isengard, nor would being the lt. in Isengard make him second in command. THe Mouth was clearly just thinking of it.
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The fact remains that this occurs in LOTR and none of your alternative suggestions as to who would be Sauron's 2nd have any textual back up at all!