I agree with Inziladun.
It's possible that all Sauron would've had to do was offer it a position.
We know that when Morgoth wasn't around, the Balrogs waited for him to return. The Balrog of Moria was probably waiting for the Dark Lord to come to power again. If Sauron had become the dominant power in Middle-earth, the Balrog and any other creatures of Morgoth that were hiding away would probably have come on out and joined up with Sauron.
This is interesting to me because it shows a distinction between the Balrogs and Sauron, who were of the same order of spirits, although not necessarily of equal power. The Balrogs weren't ambitious. They didn't desire to rule. They seemed to be content as military captains.
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