Who knows about the Precursors existence?
We as readers know "a lot" about them, but in the lore who is aware that these beings even existed?
Many of the last forerunners didn't knew much given them erasing records of the genocide, so on this faction the UrDidact (his essence in the domain), the Librarian's AI in requiem, Chakas/343GS, and now thanks to CamEv we know 2401PenitentTangent was taught of them. Also would Fortencho's essence in the Domain also know?
For the covenant most likely nobody knew anything at all, perhaps any luminaries may have stored records and one or two prophets knew? Would Medicant Bias know of the Precursors due to the logic plague? Would he tell the prophet's?
Atriox managed to get the Hand, but does he knew about their makers? Was he later taught by the Harbinger?
Would the Endless know anything about them? Being only made aware of the rest of the universe after the array deleted Abaddon.
On that same note, would Cortana know of them thanks to accessing the domain? Did the Gravemind ever clued her in during her torment, as he did with Penitent Tangent?
Anyone in humanity know of them? How so? Could Halsey have deciphered anything around their existence?
The events in Outcasts with The Nothing could very well make Rosa Fuertes the only still alive (ignore UrDidact) being to know about the Precursors at all.
Thoughts?