WARNING MASSIVE SPOILERS BELOW!!!
DON’T SAY I DIDN’T WARN YOU!!!
In the Level Reclaimer in Halo 4. The librarian shows up and talks about the Human-Forerunner War to chief. The Librarian tells chief that she planned everything about humanity. Master Chief, The Spartan program, The UNSC, humanity’s Technology advancement, and even the AI Cortana was all planned by her. Then she tells chief that she did this For Humanity to take the Mantle of Responsibility and prepare. Master chief asks “Prepare for what?”. Then the didact really has to interupt them.
This makes me wonder if she is talking about the Precusors return and knew this would happen and was forced to plan out the evolution and the history of Humanity. This might mean that the Precursors might be in halo 5 or 6. The chief encountered Forerunners and now that the Didact is dead, (Possible return in either games) there are barly any Forerunners left. Now it might be time for the Precursors. The Precusors have a roll in the halo universe. such as creating The Forerunners, Humanity, and the Flood. It is said (I don’t know if this is true) that the Precursors will return and test humanity on the Mantle, this might be the source of the librarian’s plan to make humanity control the Mantle and prepare for the test.
Comment below if you think this is a good or possible theory or if you have an opposing Theory of the their possible appearance in halo 5 ot 6.
Thanks!