Bulgarians
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Bulgarians
Early Medieval cranial series from Slavic centers of Croatia looked exactly like early Slavic skulls from eastern Poland and the least admixed series of Wendish skulls. I doubt they were admixed to any significant degree, but not sure about the Slavs further south.
Two Krakauer samples with the least Germanic and highest Balto Slavic drift are in fact KRA006 and KRA009. One is more Ukrainian-like and the other more Belarusian.
Some of those you used as Balto-Slavic are in fact Lithuanian-like+ a bit of Germanic.
To me it looks like the tribe which spread R-L260 was Baltic-like, and the other Slavic tribes were Ukrainian-like. The correlation seems pretty strong actually.
Most Slavs have ancestry from both groups, but for example Kashubians look Lithuanian+Scandinavian without any Ukraininian-like, se they are probably the purest descendants of the "R-l260 tribe".
I know here is now a fight going on so maybe not the best situation for coming with a factual try. But nevertheless:
The question whether one can be modeled with a good fit or not is not descisive for the question whether that modellling is applicable or not. It can therefore also not be of relevance for the question whether Sunghir6 should be used or not for such modelling. I myself considered Sunghir6 suitable, but the only valid point is if Sunghir6 can be considered a good proxy for proto Slavs. On the G25 North Europe PCA it plots perfect, but there might be other differing traits that are not visible on that particular PCA. If Sunghir6 has something that the other unquestionable proto Slav references do not have, that Sunghir6 from the logic can not represent proto Slavs (only).
The paradoxon is: the more you are right that you need Sunghir6 for a good fit modelling, i. e. it makes a difference, the more questionalbe Sunghir6 gets as an applicable reference for proto Slavs. Because for an applicable reference for proto Slavs it should not make a notable difference if you remove it or not.
You could theoretically still be right, but only if you make plausible that all the other proto Slav references are mistaken. I guess this can not be done.