Good article, Mike. Does seem like a lot of speculation, but that's not a bad thing. Either way this is an amazing find.

It's not directly related to biological evolution (although the change of the environment probably altered the course of evolution for many species). "A Law" is a model (description) of what happens. "A Theory" is a model or family of models that explains how something happens. Neither word has anything to do with the certainty ascribed to the model.

A few things we can check on later:
Whether there was any indication of a full-fledged written language.
Where the placement, articulation, or orientation of the megaliths reflects a knowledge of mathematics, astronomy, etc.
The origin of the stone, tools used, method of transport, if not carved in situ.