Maros has yielded solely one J2b-L283 and not just any clade but Z615. One sample doesn't make an archaeogenetic spring. The majority of the paternal distribution is made of Yamnayan R1b-Z2103 and Neolithic I lineages. The chronology and links you are seeing to Matt-Painted Ware, Kuc a. Zi culture are where exactly backed up by archeologists? Leaving aside the connection through Balkan Post-Yamnayan dispersal of course. Cultural exchange and population mobility between neighbouring populations is far from being a rarity so lineages of xyz culture will be found in neighbouring xyz culture throught different time spans. In one more often than in another time frame.Quite dope. So Kamenica was packed with R1b. Time and time again, the region looks very patriarchal in nature. It is interesting that in Maros both Z2103 and L283 are found together, yet a couple of kilometers apart in Montenegro/Albania we have exclusive R1b or exclusive L283 burials.
The aDNA territory of EBA-MBA-EIA-IA-CE for J2b-L283 is well defined and not just the result of "only because they were patriarchal otherwise there would be also a lot more other stuff" "they shouldn't be above the percentage observed in Cinamak (the southeastern most extension etc. etc.)"
The reason why MBA Ulanci, Matt-Painted Ware, Brnjica, Paracin have a different homogenous patrilineage is because they are a different cultural horizon. There are intermediary regions and Albania is not home to just one cultural complex.