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Channeled-Ware/Gava shouldn't exclusively be linked with Thracians btw, there might be Western Channeled-Ware people who might have shared same ancestry as Thracians except having less Iranic influence in comparison with Geto-Thracians.
Also, i believe Z5018/Z5017 is to be linked with the Channeled-Ware phenomena, non Z5018/Z5017 E-V13-ers could have been present among Vatina, Brnjica but they weren't as successful in spreading as Z5017/Z5018. And, it's likely that Z5017/Z5018 were Indo-European speakers while the rest could have spoken some sort of Southern Tell Cultures language, Neolithic survivor.