Do you think that the those 2 samples are good represantives of regions like the Macedonia overall in that time, or were there a minority of newcommers?
Given what we have so far from that area, including the Illyrians of the Iron Age (who plot even further North) and Thracian samples I would say that they are good representatives of most tribes living in that area around 2000-1900 B.C. Although there could be Early Bronze age (low Steppe) people in the Macedonian region as well. These people would be the older inhabitants. Likewise, I think that in Greece overall, even further South, there may have been tribes similar to these 2 samples we found. They could have been living a seperately, according to their own customs. Some intermixing here and there may have taken place. Hence the low Steppe admixture in Mycenaeans. It may even be possible that, further down the line, even though almost everyone spoke Greek during the iron Age, there may still have been substantial differences between the tribes in Greece. Some may have had more Steppe admixture, and some less.
As for classical Macedonia, I think they must have been somewhat different compared to those samples. We know Slavs were absorbed, especially in that region, around the 6th century A.D. So how can the people in that area today have the same level of Steppe admixture as these pre-Greeks from around 2000 B.C.? The people prior to the Slavic migration must have had less Steppe admixture.
I think we need severall samples from Classical period and late Bronze Age one in northern Greece.
Definitely. Samples of Classical Greece from different regions. That said, I am almost sure the Classical Greeks were not entirely homogeneous. There were some differences between Cypriots, Ionian Greeks, mainland Greeks, Cretans even then. Same is probably also true for Thracians and Illyrians.