SPOILERS FOR CRYPTUM & PRIMORDIUM
So I just finished reading Cryptum and Primordium and there is some things I think I’ve figured out.
We’ve been told the Prometheans were fighting aren’t organic which leads me to believe they are the armoured ancillas bornstellar sees when going to the forerunner capital.
343 Guilty Spark is Chakas this happened thanks to the composer.
We can assume the Captain and ONI scientists talking in Primordium are Thomas Lasky and co aboard the Infinity.
Guilty Spark as we know him was not the TRUE Chakas but one of the many personalities of his ancestors which come to the surface and take over.
The Infinity found some sort of memory fragment of Guilty Spark and he took over the Infinity and is heading back to Requiem because he wants to find the humans that have the spirits of Riser and the girl (I can’t remember her name) because its not the Guilty Spark we know but the TRUE Chakas.
Bornstellar is also more or less the Didact now and we can assume the old Didact was killed by the master builder.