Saw this on Trekmovie:
JJ Abrams wrote:
His name is John Harrison and he is sort of an average – that is what makes him so scary – he is just an average guy who works in an organization called Starfleet, and he turns against the group because he has got this back-story and this kind of amazing secret agenda.
Seems average humans in the future are extremely capable.
Also: He really IS a member of Starfleet, not just posing as one or been randomly given a uniform "Space Seed" -style.