The Didactic Factor

Has anyone thought about the whole Didactic and just how he Factors into Halo 5? Or what about the remaining San Syrum/ Prophets? Couldn’t there be more to the Story then what we are seeing? I feel like either we are missing something or they are seriously leaving something out… Are there more books and such? Are we getting more out of game content? If it’s two books a year that’s six books worth of content and 50 comics and a TV series and whatever else… It’s really the Didactic Factor.