Story unravelled (sorry SE) (Spoiler: Patch 6.2 - 7.0)

[Kesey]

I think the only thing that is for sure is that Golbez will remove his helmet and reveal himself. They've done this with every villain, except Estinien possessed by Nidhoog.

I'm not sure that most of the connections made by the original post are even going to factor in here.

But I think Golbez being connected to the Ancients is likely given that one of the final scenes of 6.2, which is a flashback Golbez has shows him with what appears to be an Ancient. Plus the 6.1 cutscene claims they've waited nearly 10 thousand years to execute their plan.