Also, I think Legolas' comment about the Balrog in Moria (Durin's Bane) makes it pretty clear that Sauron was not a Balrog:
Quote:
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"It was a Balrog of Morgoth," said Legolas; "of all the elf-banes the most deadly, save the One who sits in the Dark Tower."~The Mirror of Galadriel
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