Ok guys so the Diadict is basically Dr. Eggman also known as Dr. Robotnick 
He uses the composer to turn people into robot warriors. Dr. Eggman uses the robotisizer to turn anthropamorphic characters into robot warriors.
I swear I face palmed when it was revealed in the game. It was suposed to be shocking or something, but man, Sonic the freaking hedgehog did it first.
Also I don’t think the Diadict died at the end. Also I was thinking there would be a boss fight aginst him and was disapointed by the granade solution. Also don’t like how the granade somehow functoned differently than it did in game. Also Cortana somehow saving the cheif from the bomb was just stupid. Maybe if it were obvious that there was a timer or some sort of window of time between the cheif hitting it and it going off. Maybe a count down and a toss would have been enough. Also I was expecting Cortana to use the composer to make herself a body. She kept mentioning how the promethians had the same type of coding that she had. I know the device didn’t eat her human body, but if she went into it and activated the thig that makes the promethians she would have probally come out ok because she wasn’t eaten by the composer thing.