There were only 7 Balrogs there weren't hosts of them. They were fallen Maia, like Sauron. Maia did not reproduce, so there were no lesser Balrogs to be made. There were seven and no more. I seriously doubt that Sauron had any power over them because they were of the same race. I don't think that there were any lesser wraiths either they are nowhere mentioned in the books. Neither were wights. Sauron's strength was in his orcs, trolls, and wild men. Other creatures than that were few and far between.
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