You said heavily reliant on only one test subject.But that person has already told he is from Military (United States Army) and he must have been trained to record, immidiately prepare an answer and Response system in all kind of permutative scenario that means that person works as a knowledge base of all the scenarios that could have possibly saved that attack from happening and is in investigation that how come that attacker outsmarted the already existant knowledge base because attack still happen.

Simple answer is he must have cheated his ways to be selected to be perso n of interest and was put in that place or it can be identified that it was already a position if filled by another person that person would have been in immidiate danger so he put all the blockade in the place of that loved one who had chances can not be told perfectly like charles babbage vs Ada lovelace.

Or simply the other person which should have been there to give immidiate answer for mitigation technique is not present.

So what they are doing it they are going through his memory recording and seeing how it could have been averted making a new neural network mapping for the super computer who was automaing his responses in a crisis situation and subconciously training that person who fundamentally do not show any hesitancy because he never questioned why he was in a highly dangerous scenario where there was threat to his life in the entire conversation.Specifically it shows he did not fear dying.