There is no factual radiocarbon dating for the henge rings, but I agree they are earlier than the step-pyramid on other grounds. I hesitate to draw any definitive conclusions from either hypothesis at this time, but the connection seems to be through Brittany. Based on French Radiocarbon dating, I think there was a massive earthquake in Brittany approx 4000 bc +/- 300. For this and other reasons the builders of Locmariaquer and Kercado etc, spread both North and South ...See dates for Irish Boyne Mounds, there are also 3 Mounds in the sequence there. To say the authors have, "cracked" anything is pompous and unprofessional. Clearly a marketing ploy.
Something is not right. This message is just to keep things from messing up down the road