Re: Orci, Kurtzman and Lindelof should not Return.
TOS said "Under his rule". Which tells his nothing of the nature of his rise to power.
Spock also says that records of the time were "fragmentary". Which means they would likely have an incomplete picture of Khan's rule.
"...the most elementary and valuable statement in science, the beginning of wisdom, is I do not know." - Lt. Commander Data, "Where Silence Has Lease"