The Tumulus culture largely destroyed all local groups up to the Tisza. The question is whether the Tisza-Transtisza groups which formed Gava were I2 like those to the West, from which they were differentiated already before, or not. I say not, and that they had more E-V13, rather, but that's not completely proven yet.
However, all the groups up to the Tisza were R-L2 dominated and we know they just shifted to cremation under local, Eastern influence, of these Tisza-Transtisza people. Others were rather irrelevant for that and had left the scene by that time. Like the Encrusted Pottery remains ended up in the Central and Eastern Balkans. And the sample we got from there was high WHG and I2, just like the ones from Hungary and Croatia were high WHG and dominated be either I2 or G2, just like the other Danubian groups before Tumulus culture and the Urnfielders, respectively.
However, all the groups up to the Tisza were R-L2 dominated and we know they just shifted to cremation under local, Eastern influence, of these Tisza-Transtisza people. Others were rather irrelevant for that and had left the scene by that time. Like the Encrusted Pottery remains ended up in the Central and Eastern Balkans. And the sample we got from there was high WHG and I2, just like the ones from Hungary and Croatia were high WHG and dominated be either I2 or G2, just like the other Danubian groups before Tumulus culture and the Urnfielders, respectively.