To me the fact that he has so far evaded the authorities after such a brazen killing captured on video camera on the world stage points to a very well planned, organized crime (or “terrorist” attack of sorts). He may have carried this out on his own, but he was trained by some militant organization most likely and they could be behind this. Just the fact that he seems to be ten steps ahead of LE and the FBI tells me he is not any ordinary, disgruntled citizen or even an ordinary hitman hired by BT’s associates.