the librarian's fangirling is not just for no reason. Her ex's hate created a lot of guilt. Plus all those Andromeda revelations. i prefer less two sides of the same coin and more of the Precursors create's Forerunners to serve them directly. then precursors seed the galaxy with life. Pre-Humans eventually evolve through happen stance and luck. Precursor's like results of their experiments so they want to give Mantle to Prehumans. Forerunner's feel entitled cause they came first. Forerunners usurp the mantle. Kill their creators and rule the galaxy till the whole Precursors become the flood thing. Now why did the Precursors want to give up the throne in the first place?