Here’s a good link to the supplementary section from the Mokrin study that’s been available for some time that contains valuable details about the site and the Maros Culture:
https://static-content.springer.com.../MediaObjects/41598_2021_89090_MOESM1_ESM.pdf
The J2b L283 Z615 guy is grave 163. High status burial with stone battle axe and beakers. Status was not inherited but was likely correlated with physical strength/prowess/hunting ability. He was about 55 years old at time of death and was second tallest individual. Relatively high Yamnaya component. Interestingly, 2 of the R1b Z2103 samples have lower Yamnaya and higher Iron Gates HG.
Some interesting details:
The Early Bronze Age (EBA) necropolis of Mokrin (Serbia) is situated at the site of Lalina Humka, close to the town of Kikinda in the northern Banat, Serbia. It was a part of the Maros culture which represents a set of communities, spread out through the territories of southeastern Hungary, western Romania, and northern Serbia, between the Karas river at the North, Tisa river to the west and Zlatica and Galacka to the South. Most archeological sites were found in vicinity to the Maros and Tisa rivers, and due to their similarity in the mortuary practice and material culture, it was suggested that these sites represent a cultural entity.
The Mokrin necropolis was systematically excavated from 1958 to 1965 under supervision of the National museum of Kikinda. In addition to 312 graves, which were excavated and published in great detail, some 50-100 graves remained unexcavated.
In total 24 radiometric dates are available from the Maros group, which flourished from around 2700 cal BC until 1500 years cal BC, with a possible peak around 2000 cal BC. Six absolute dates from the Mokrin necropolis are in range from 2134 until 1737 cal BC, according to the uppermost and lowermost 1σ boundary of the oldest and most recent date, which settles the Mokrin cemetery into the first half of the Maros sequence and EBA (Supplementary Table S1). This is in concordance with the relative chronology based on the typology of material culture. The Mokrin necropolis was probably abandoned by the Middle Bronze Age period of the Maros sequence.
Even though it was assumed that Maros communities lived in both open settlements and on hilltops that protected them from seasonal flooding, there is no evidence which suggests any differences in activities, functions or household architecture between these two settlement types. Maros houses were relatively small rectangular dwellings, with clay floors, interior ovens and hearths, multiple rooms and large storage pits, and were probably home to single nuclear or small extended families. The locations of Maros villages in vicinity of rivers provided a good setting for regional trade networks and the movement of material (such as gold, copper, and tin ores).
Skeletal remains of domestic animals (horse, cattle, pig, sheep/goat, dog, etc) and wild mammals, such as red deer and beaver, suggest that inhabitants of Maros culture settlements were practicing agriculture, animal husbandry, hunting and fishing in everyday life. Maros inhabitants also domesticated barley and einkorn, plants of low yield but high resistance to wet and unpredictable areas of rivers. They were active in cloth weaving, production of ceramics, and metallurgy.
The high status J2b L283 was a beast (grave 163) with the grave goods, including stone battle axe, possibly related to Arnold Schwarzenegger:
Porčić and Stefanović (2009) combined the archaeological and biological evidence to study connection between musculo-skeletal markers of physical activity and social status, and to answer the questions regarding the social structure of the Mokrin necropolis and to explore whether Mokrin was a ranked society. Although the basic hypothesis was that individuals of higher rank would be less physically active and vice versa, the results showed that intensity of activities was not related to the vertical status of an individual in a straight-forward way. There was an opposite correlation between social status and the development of shoulder and arm muscles when sex is observed separately, demonstrating that some rank was present. The males of higher status were more involved in upper body physical activities than males of lower rank, either due to a specialized activity related to their specific high position (e.g. weapon handling), or because they had to achieve their high status through the success in warfare or hunting, not through inheritance. When less physically active men were observed, there was a correlation with fewer grave goods.