The exogamy and females mobility question :
Since some time I read papers or abstracts about this. It seems to me the perspective is somehow wrung in readers heads.
1° I doubt that the most of distances between their birthplaces and new living places would have exceded 70/80 km a sa rule.
2° I doubt these females would have been the whole culture transmettors in these patrilocal and viril warlike societies even if we may suppose some of the household usages came with them.
3° I rather think the cultural changes could have been the results of contacts between differents groups, involving exchanges of skills and political-economical alliances where females were part of the deal, not only as « stuff » but also as honour hostages and guarantee of peace, at least for the high classes ones. It seems it was not so seldom in Antiquity.
4° I’m afraid we are far from the reality if we believe males quietly stayed on place and sent their wives and daughters as ambassadors. We have more than one mobility : collective moves for new lands involving men and wives but surely decided by prominent males as a rule ; marriages all around with females taken outside too closely related villages (low statute) or outside the region for political/economical purposes (high statute) ; young (male) warriors searching adventure and glory with raids, taking foreign females « on the road », sometimes returning home with them, even if the first aim was not chasing wives.
What I think I’m guessing in the BBC ‘s multi-aspects question is that males moves sometimes very far and fast, with or without return. Females moved on shortest distances and withouth this romantic « freedom » of female pioneers alleged by someones. So, long distances moves towards limited numbers of directions for males (and some of their previous females) with often changes of country and times of stability over several générations (migration) opposed to permanent moves for females at each generation and on every direction. Evidently some specific groups of men moves more constantly and on every direction for precise purposes (metal ores, trade etc...)
We could see too differences between Strontium variations and auDN variations because the females, spite coming from far enough place, could have had more and more similar DNA as time passed.