I’m not really an expert on Y-Haplogroups, but I’ve seen some people over the years argue that early Corded Ware Culture are either wholly descended from Sredny Stog, or Sredny Stog + Yamnaya + Baltic HG with Sredny Stog paternal lineage.

Can early CWC be modeled with Sredny Stog? If so, how does it turn out? From what I know Sredny Stog got EEF dna from Cucuteni-Trypillia, which is genetically very similar to the GAC DNA many people associate with the Corded Ware Culture. But I would expect CWC to have some yamnaya DNA in order to account for Corded Ware still having fairly similar EEF % as Sredny Stog despite expanding into Eastern Europe