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What kind of social structure? The most economic and political interaction possible!
In the example with ostracism, it is clear to anyone who can read that the city's population possessed real (not nominal) power and could exile undesirable citizens, including those in supreme authority. And it was precisely the city's citizens, not the ruling elite.
In the example with Mohenjo-daro: toilets, statues in large quantities, division into a citadel and a lower city = trade, service sector, division into military and civilian classes. :D Something like that.

You are apparently not reading the discussion carefully. The topic was about political and economic interaction between different regions.

I won't even mention the yoke, if several dozen mass graves with signs of violent death from different time layers do not convince you, then nothing can convince you.

In the text you quoted, there are no phrases about different time layers. But let's assume that's the case - what should it convince us of?

On Earth, I think there are dozens or hundreds of mass graves with signs of violent death from different time layers. The settlement and consolidation of humanity are strongly determined by geography and terrain, so military conflicts also do not occur just anywhere, but in areas where the habitats of different tribes overlap.

Specifically in the case of Slavs vs. Mongols, the presence of a series of such burials means that it was in this place that the warring parties met. And nothing more. Occam's razor is quietly peeking out from behind the corner, so other arguments need to be found for further development of the thought.

The problem here is that we need not confirming arguments, but proving ones. That is, arguments that not only do not contradict the stated version (confirming), but also contradict alternative ones (proving).