The thing is though the Didact was never actually evil. Bungie might have created both the Didact and the Librarian and not 343i, but 343i [i]did[/i] completely contradict what little character that Bungie had established for the Didact and what we did know about him. The story of the Didact and Librarian in Halo 3 is nothing at all like what 343i did in either Silentium [i]or[/i] Halo 4. It'd have been one thing if 343i had just had the [i]actual[/i] Didact die and had the character Bornstellar be the replacement and essentially the Didact in everything but name only (which is what the case was at the end of Cryptum and in Primordium as well), there'd have been nothing wrong with that at all as it still leaves the Terminals in Halo 3 as they are and the Didact is still in character and doesn't change anything about them. But what they wound up doing with the Didact and having the original/actual character turn out to be a villain is absolutely unacceptable and completely undermines and contradicts his character.