I concur that the Durin's Bane passage gives no indication that the Balrog always has wings, but I stand by my interpretation tgat when the Shadow that makes up its substance takes the form of wings, they are indeed wings.
Because yes, Tolkien initially says 'spread out like wings', to describe the change of shape ('spread out as wings' would be very clumsy, don't you think?). But only a few paragraphs later, when the fact that they are of Shadow has been established, he drops the comparative: 'its wings were spread from wall to wall'.
Not 'its like-wings'. Not 'it seemed it had wings that spread'. Just 'its wings'. Like the 'mane' of fire, the 'wings' of shadoe have become a feature of the Balrog - of this Balrog, at this moment.
hS
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