Angela, people have been discussing those issues you mentioned alot over the last several months. Most of us think Yamna was 25% ANE, 40% ENF, and 35% WHG in terms of ANE K8. The reason we think this is because of the gazillions of scenarios we've played out. When we use this theoretical Yamna north euros always fit best as 50% or more Yamna, which is consistent with this leak. Many of us have known north Euros are mostly Yamna for a long time, by connecting the dots from other leaks.
Yamna was not 50% near eastern, they were 50% something similar to modern Armenians, who are a little more near eastern than Stuttgart. The reason north euros today have less ENF than Yamna is because of Late Neolithic farmers like Gok2(who had as much WHG as Balts) and then also late Neolithic hunter gatherers like Ajv58, who had no near eastern ancestry. We have to remember most of northeastern Europe when IEs arrived was hunter gatherer country.
Balts actually fit better as a mix of something similar to Motala12 and theortical Yamna, with no EEF in the equation. CWC was not Yamna+EEF, it was Yamna+HG+EEF.
The last thing I want to say is you're not the first person to give those doubts. People have disected those ideas, and there's no doubting anymore Yamna-types made a very big genetic impact on Europe, largely or mostly in the early bronze age. Reich knows this because he has central Euro genomes ranging from 7,000-3,000YBP, right before historical times, and Yamna ancestry stayed and was probably at a modern-like level. If ANE 3,000YBP was much lower than it is today, he would say something.
