[jasonwatkinspdx]

This is overly simplistic imo. We know that H&G groups periodically congregated and cooperated in groups far larger than a single band, such as to share in hunting the seasonal peak of herds. It's not that much of a stretch to believe they'd periodically congregate to advance a construction.

[preordained]

Umm...Id say it's a stretch. Wanna hunt together? Wanna quarry some stone and build a temple? I don't think we are talking about apples and apples here.

[jasonwatkinspdx]

I disagree. I think it's entirely likely things started along the lines of "We gather here every year this season to share in the peak hunt festival. Let's make a mark upon this place" and over a few centuries that grew motivating enough for people to incrementally build more elaborate megalithic structures. This is just my view, and I'm certainly no anthropologist. But I would point out this narrative exactly matches what we see at Gobekli Teki: layers of megalith construction, each covering and supplanting the previous.