Blizzard hasn’t said anything.
I have some data that shows a very weak effect. https://docs.google.com/spreadsheets/d/1abyFItI1HLNKOmyUKadbcMPnzwFV3TGiOIIYB7HvowE/edit?usp=sharing -> Rainbow 10, second plot.
Better data would be two people in a two stack, with an SR that is not close. I suspect that their SRs would converge to each other over many games played, but I don’t have this data, so I don’t mention it in my post above.
I could look at your data, as well, if you’d like to share it.