I am the Mouth of Sauron.

[The Might]

Originally Posted by The 1,000 Reader

I see the Mouth of Sauron as I see Sauron in the First Age.

Fancy rank, not much else.

I don't agree.
Sauron was indeed only mentioned a few times in the Silmarillion, but this does not mean that he did not play quite an important part. The same kind of logic is used by many to show that Glaurung is stronger then Ancalagon for example, but just because a character is mentioned more or less in a story doesn't mean that he didn't play a very important role in the events that took place.
He is only mentioned as the one that controlled Tol Sirion and in context with the events that led to the Quenta Silmarillion. Again, in the Quenta Silmarillion during his duel with Huan, and lastly as he repents after the War of Wrath.
Still, it is stated that he was very important for Morgoth, and many of his actions arenot mentioned in the text. It is however clear that he had great power to be of the same rank with Gothmog, and also from his duel with Huan it is clear he was not weak either.

[Legate of Amon Lanc]

Yeah that's it, Sauron just was not so important for the stories presented in Sil, as well as the Mouth was not so important for the story. In this way, Tom, Bert and William were more important than Mouth of Sauron in the story. But you can't forget that there are another thousands of people in the Middle-Earth whose actions had strong impact even in the large view, but they are scarcely mentioned. And there were thousands of people who lived their lives and did many things. For example, if we had a story of the fall of Ost-in-Edhil, I can bet that we'll all know about the famous Elven Smith, who was in very high rank, gave good advices to Celebrimbor, and he even was at first against the agreement with Sauron. He was a good and funny fellow, and in the end, he was slain by Sauron himself on the stairs to the House of Mírdain when covering Celebrimbor's escape, which even though was in vain eventually in the end. And we will all know his name and remember him as one of the great heroes in the "hall of fame". Now, since no one wrote the story, we have no knowing of such a person.
Note: I hope you understand that this person never truly existed. There is no mention of such a person in all Tolkien's works. I totally made it up just for purposes of this post and any resemblance to actual persons in Tolkien's work, living or dead, is purely coincidential