I expected John Harrison, rogue secret agent with superior abilities. The film didn't need Khan and his 72 followers. It could have been John Harrison and his group of agents held captive by Admiral Marcus.
So we would have had a man with superior abilities, who is out for revenge against a Starfleet admiral and his followers who also have superior abilities who are in cryo-storage for the most part.
So this doesn't sound remotely similar to an already existing trek villain?