Seriously, though, the sniper has pulled off some amazing performances: He has consistently been able to set up and take a shot in a crowded commercial area and get away. Surely someone has called up Horiuchi and asked: "Hey Lon, just a hypothetical, if you went hunting for innocent civilians in commercial strips, how would you do it? Not under color of authority, of course, so you would actually have to get away."
Just the fact the sniper has repeatedly done this means that a useful profile of his probable methods can be deduced by experts - and should have been by now. It isn't showing competence or inteligence that this keeps happening.