I have two comments, number one it never says that Sauron lost the ability to change his form, only that he could no longer assume a fair form. Also Tolkien specifically stated that the Balrogs became bound to their bodies permanently. This probably occurred after the Battle of Powers.
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Yet the lies that Melkor, the mighty and accursed, Morgoth Bauglir, the Power of Terror and of Hate, sowed in the hearts of Elves and Men are a seed that does not die and cannot be destroyed; and ever and anon it sprouts anew, and will bear dark fruit even unto the latest days.
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