To be honest, I'm more interested in what ideology/religion lead to the Yamnaya Y line taking over a continent in a timespan of over thousands of years to almost utter replacement despite of the fact that, in the end, the "invaders" were almost identical to the "invaded", than I am in elucidating whether Llama 3 being less performant than Gemma 4 in benchmarks is due to the training corpus or the architecture.
I don't feel like being racist either way.
There’s really only one way you totally replace male lineage.
Based on the evidence we have it seems that they simply killed most (in some places almost all) of the local men they could find?
Regardless of how you feel about being racist, some people will accuse you of being uncomfortably close to a Nazi for talking about the Yamnaya Y line taking over a continent, because 19th and early 20th century anthropologists that the Nazis liked and amplified the ideas of really did think that the Yamnaya Y line took over a continent, they just called them "Aryans" instead of "the Yamnaya Y line".