Would you mind providing an example for your first point? I can't think of one.
Sure, the MP difference isn't as big in my example, but I had to chose cameras with comparable sensor tech. And unfortunately the 5DS isn't quite the same tech as the 1DX II, as it doesn't have DPAF yet. So any difference could be explained by sensor tech. Nonetheless, I don't think the 1DX II really outperforms it purely in noise. One also has to keep in mind that higher resolutions allow for more effective noise reduction. And that the R5 also has a new sensor. I don't see why the R5 would lack any optimizations the R6 is getting.
I guess that the R6 is just reusing the 1DXIII sensor. Looking at the comparison, I would hardly call that notably better than any of the others:
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