Hang on a minute!
1)Why would the Balrog want to leave Moria and serve UNDER Sauron? If I were him I'd much prefer to keep my underground kingdom than serve as someone's second in command.
2)Why would Sauron want another powerful Maia around. He could see the Balrog as a threat and would probably prefer it if it stayed in Moria.
The Ringwraiths are strong but against a Balrog, I think not!
If they quarrelled then Sauron would be the only one in Mordor who would stand a chance against it. I doubt that he would like those odds.
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