Yes I know the Steppes were slowly getting mixed with East Eurasian admixture but I think we were speaking about a people ethnic origin and not there genetic make up.
Yet this is still incorrect. What we clearly see here is that Early Saka were predominantly West Eurasian (+90% ) and slowly when they expanded towards East they
absorbed East Eurasian dna within time. But how does that play a role in the ethnic origin of Sakas?
Obviously all Iranic speakers mixed with other respective people of their region. Or are Punjabis not Indo_Iranians because they obviously mixed with tribal Indian groups? I kinda don't see the logic behind this and don't understand how this is important to our discussion that Saka were an Iranic tribe confirmed by linguistics and archeologists. It doesn't matter much how much of non Scythian genes they absorbed in some places in that case.
Just because a, let's say my brother marries a woman from a near by tribe and brings her to ours and she becomes part of our tribe, does that make their children anything else but Kurds? I think you have a different view because you are not used to tribal thinking as much as I (not meant in a disrespectful manner) . People who incooperate into a society (mostly females) become part of it. And in the case of Sakas we see that geneticwise there was a change but culturalwise not. Therefore we can speak of genetic absorbation but not an "ethnical change".
Also as I pointed out before the Bronze and early Iron Age Saka from all of Kazakhstan were almost fully West Eurasian. Only when they expanded further towards east into the Altais they absorbed genes from local people what is very normal, as Indo_Iranians did when they reached India, Pakistan or Afghanistan. But that doesn't make them any less Iranic, because Iranic is a ethno_cultural designation to which more than just genetics belong (Culture, Religion, Language, political motives and genetics). All Iron Age Iranic tribes differed significantly from their Proto Indo_Iranian forefathers
at least slightly and Sakas from Altais were not an exception to that.
pazyryk culture was the furthest the Scythians expanded.The primary homeland of the Saka (from where they expanded) was Kazkahstan
as seen on this map