Yes, looking at the Myers debunking, Badgeman (and the one presented on this thread) can be dismissed.
In fact, look again at the Moorman photo, it's plainly obvious that any gunman's line of fire from behind the picket fence would be obscured by the white wall. They would have needed some pretty magic bullets to shoot over it, then down to JFK's head.
So what to make of Arnold's account? Weird.