Ah I was to tired yesterday, my english sucked, two mistakes in the Thread topic, I am sorry
KI is the german abbrevation for "Künstliche Intelligenz", or Artificial Intelligence.
If one of them is an Ace, the other guy (that PTA guy) is most likely one as well. Not only they perform noticably better, they also have dozens of red stars painted around their planes nose, most likley their air victory count. At the moment I do not remember for what kind of campaing that was, I´ll check at home, though I think by your description its an original campaign.
Anyway, back home I´ll try to shoot them down first, after all even an ace does not take more hits of MK 108 than a green pilot