Originally Posted by Brother Lucian
I find it noteworthy that Dark Angels Primaris Librarians gains both the Deathwing and Unforgiven keywords. Meaning that they mustve been appraised about the Fallen Angels. One can now wonder how much of it G-man himself knows now.
Perhaps the Dark Angels secret is not as devastating as its been made out to be. Or perhaps Big Blue simply can't afford to create a problem where there doesn't need to be one.
Your both assuming Guilliman knows anything at all. Just because he had some part to play in creating the primaris marines and giving access to them to the other chapters does not mean they told him the secrets of those respective chapters.