As far as theories go, mine is that Sauron is disguised and in Eregion manipulating Celebrimbor to believe that they need mithril to keep the elves from dying out in Middle Earth.
Celebrimbor had now convinced Gil-Galad, and that is why the 'forge' needs to be built by the spring because supposedly the light of the elves is dying. Elrond called the story of the origin of mithril an unproven myth, so not sure why Gil-Galad believes it other than he has been convinced by Celebrimbor.
Another reason for my theory is in episode 1 there was a meeting Elrond wasn't invited to. Seems strange to mention that as a plot point.
There is also the quote from Adar about how much of what you believe to be true is a lie, which seems oddly specific to say.
I think Numenor will go go attack Adar and his forces and wipe them out, which will allow Sauron to keep hiding as people will think the threat is gone.
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