Maybe it's not Gary, but someone else from the original episode. Two hundred years earlier, the captain of SS Valiant destroyed the ship due to the danger of one individual. We don't know if he successfully eliminated the threat. Maybe that individual doesn't get a name until now.
Not a bad idea. In the Nutimeline, the Enterprise responds to the Valiant's distress signal and rescues Harrison...etc..etc..Kirk ignores all the warning signs or Spock's advice...etc..