I think that's the right approach. We've learned that we should be cautious in speculating about what yDNA will show up where and in what time period.
So, I don't know what else may turn up in Vinca. However, it seems that Sopot, Lengyel and BL represent a movement from the south, a later movement, it's true, by about 700 years, but to reach the Sopot and Lengyel areas one route would take you through Vinca territory. So, early Vinca may not have had E-V13 and J2, but later Vinca (which continued for another 500 years), or at least the area around Vinca, might have been a different story.
I posted this map before. Someone asked for a source. I'm sorry but now I don't remember who asked or in what thread. My apologies. Anyway, it is a map of the Neolithic
cultures which comes from the Wiki article on the Lengyel culture.
https://en.wikipedia.org/wiki/Lengyel_culture#/media/File:European_Late_Neolithic.gif
If
people go directly to the link, it can be read without benefit of a magnifying glass.