Seeing as People still seem unable to understand the Didact's motivations in halo 4 i wrote a post explaining such. If there are any issues you see or things you do not understand, please post. I will try to explain further for you.
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Too bad you never really see any of this explained in the game. :/ Especially after the "you won't need to read the books to understand what is going on" line from Frank O' Connor. All you get is I'm awake! *twirls mustache* time to die human!