Well that was the Burl point you have previously made, that I mentioned; too few families groups in the area. Subsequent events seem to suggest large gatherings COULD be mustered, perhaps from far afield. "Too few people" is certainly not a strong plank for asserting the sarsens were moved by a limited group IMO. It's miraculous enough without adding a second layer of miracle by postulating it was done by a much smaller group than looking at it and applying common sense would suggest.

I can answer this - Sir, me Sir, please Sir!

Durrington Walls

According to how the labour was delegated between the sexes it is most likely, I would think, for stones to be moved between Mayday, when the ground had been ploughed (arded) and sown, and Lammas, before the crops were harvested.