Starčevo-K?r?s-Criş
I wouldn't exclude a minority presence in the Starčevo-K?r?s-Criş cultural block. That would make sense from a variety of perspectives, including the fact that it settled the Upper Tisza-Northern Carpathian zone. A minority presence and survival in the Eastern part of the distribution is thinkable.
You seem to jump from Early Neolithic straight away in Early Iron Age, like nothing happened in Middle/Late Neolithic, Chalcolithic, Early/Middle Late Bronze Age. Well, a lot of movements happened during that time. We can start with Psenicevo-Babadag (E-V13) and using reverse logic we can deduce these group of people were part of Carpatho-Danubian Urnfield descended people. If E-V13 was in inner Balkans, then the most probable candidate is the Northern hemisphere of Bubanj-Hum Early Bronze Age which covered mostly modern-day Serbia.
I wouldn't exclude a minority presence in the Starčevo-K?r?s-Criş cultural block. That would make sense from a variety of perspectives, including the fact that it settled the Upper Tisza-Northern Carpathian zone. A minority presence and survival in the Eastern part of the distribution is thinkable.