So were a lot of other people. Is John Harrison a contemporary of Pike? Is John Harrison a masterful tactician? Is John Harrison any of that? (He may be a terrorist, but we don't know what his motives are or if he's mentally unbalanced.) What? Why would he have an assumed name and be walking around looking like Benedict Cumberbatch when he really looks like Steve Inhat? Why would the casual moviegoing audience understand or even care about something like that? Is John Harrison an explorer? Garth of Izar is not a recognizable character from TOS, outside of hard-core TOS fans. A recognizable character from TOS would be Kirk, Spock, McCoy, Scotty, Sulu, Uhura, or Chekov. Again, why would John Harrison need a pseudonym, if there's no real payoff for the casual audience to get the Garth reference? Did any Star Trek bad guy, past or present, need a pseudonym? Benedict Cumberbatch and Steve Inhat look about as much alike as Anton Yelchin and 60's Walter Koenig.