I do not know...Right, but....what will be the Silm Film ending to Boldog's life? That's...less clear to me right now. We've developed him a lot further than just an orc on the edges of Beren's story, so, we might not want to kill him off in a relatively meaningless skirmish.
Or, we might want to show Thingol still willing to fight and not just hide behind the Girdle indefinitely.
I am fairly confident that Boldog will survive at least until the penultimate episode of Season 5. After that...his days are numbered!
But yes, if Boldog is already dead (or has a planned death pending), then I could see us choosing to use Gorgol.
We've been very willing to re-introduce villain minor characters who were cut from the published Silmarillion. That is because, naturally, we're expanding the villain storylines quite a bit. The same is true with the dwarves; we'll need to invent characters as the ones we have die off and we need new roles. We'll likely show Belegost sometime this Season - that will be more than the texts did.
The story is Noldor-centric, though. Most of what is written...is written about the Noldor. We have less justification to add minor characters into their stories, because much of it is already told in plenty of detail. That was why Corey Olsen gave us the option of transferring canonical 'tasks' to a non-canonical character (and then killing off the canon character early). We would then not be adding to the story, but just shifting it in a different direction.
But sooner or lesser we should introduce a few minor evil side-characzers, shouldnt we?
i mean... hiw many balrogs die? Three?
and sauron gets outlawed and Thuringwethil disembodied, and glaurung and carcharoth and draugluin all get slain...
Shouldn't we have some minor orx and demon faces to interact with? I mean we do now have a thrall- noldo story arch in angband, don't we? So i guess these thralls do not just keep,amongbthemselves, butbthey interact with morgoths lesser lackeys...