now i'm starting to get a new theory. Maybe the didact will start as an enemy while cortana is getting closer to her death. since he is a forerunner, he could probably repair cortana, so Chief would have to try to form a truce with the didact to save cortana. The didadct wouldnt comply and would continue to be a threat to chief. Then, 343 guilty spark arrives on requiem, along with the librarian. The librarian feels sympathy for chief and convinces the didact to save cortana. After that, the librarian continues to counsel the didact until he eventually becomes an ally to master chief. any thoughts?