The real question here is why in a farming community were they not ALL high in Strontium? You simply did not have rich farmer A on loess living next to poor farmers B, C and D on some other soil.
These deposits were enormous, the entire settlement would have sat upon it. And probably the surrounding settlements. Check out this map of loess in Europe. http://www.ufz.de/index.php?en=15536
Clearly a lot of folk in the community ate other things as children. Did they convert to farming? Or was this a mixed community based on farming? I favour the latter explanation.
Yep looks like the farmers were patrilocal and married women who were not born into farming families. Probably because that was true for most of the available women (other than their sisters). This is not rich-farmer versus poor-farmer. This is born-a-farmer (high Sr) versus not-born-a-farmer (low Sr).Also, the map of loess soils in Europe linked in the blockquote is itself an impressive resource. It was prepared in 2007 as the first comprehensive update since 1932, to modern GPS standards. It is a valuable resource for understanding a key driver of Neolithic expansion and also later European geographical issues.