well said, indeed re: the Vikings.
I have a hard time reducing the investigating of ancient civilizations to a mathematical equation, seems so cold...but then again, I'm no scientist, just an amateur interested in these things.
I don't think they can figure out how they transported and erected the huge stone heads, let alone determine the nature of the civilization. He/they may be right about the eventual outcome, however, as their society may have de-evolved over time and they lost their technology.