[Olorin_TLA]

It makes sense to assume Durin's Bane was as powerful as other Balrogs; when Tolkien was revising the Silmarillion after writing LotR, he crossed out a mention ottwo of their being hosts of Balrogs, and wrote that there shouldn't be assumed to be more than 3 or 7. Also, in his writings about Glorfindel, one of the last things he wrote, he crossed out that he killed a Balrog and replaced it with "Demon", and contiuned to refer to it as a Demon and not a Balrog, anohter indication that the Balrogs had become much more powerful and rare in the post-LotR Silmarillion.