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Hmm. Interestingly put.

But, as is documented in Vol. XI, Tolkien placed a large X in the LQ 2 typescript with regards to the passages with which you refer.

I believe, or have thought of it in personal opinion that as many if not all of Morgoths old forces are drawn back to him for the final battle then he is of the same power level as he was of old. Not personally as powerful, thus explaining his defeat at the hands of Turin however because his "agents" that he shared his power with are all present then united as Morgoth and all his forces they would of the same power. Although individuals can still fall.

Hmm...good theory but it seems that all of his servants won't be there. It is said that only 1 or 2 Balrogs will be in this conflict and it is unknown if the Balrog King comes. All his agents don't return but most of them do. Gothmog is unknwon or not as well as many of his other champions. Really only Sauron is known to return.