yes that and some top 50 players getting a stab at it, but yes a Sigero\anir or dein\gf would just own. that needs to be avoided.
it's a gauge, not a perfect science, besides 2v2 is not 1v1 and it's not lobstercluster. but this would realte to casual whr not 1v1.
and considering what you said, there would be a risk of a returning pro whom is not listed, but im sure a history value can be applied to avoid. Also, Encourage inactivity?, increasing rust makes the cogs spin slower.
basically if your a 1950 + player you cant participate with an around equal, u have to pair with a 1800 or sub player.
Also most prefer a friendly team mate or someone they enjoy playing with, this will supersede skimming the edges of upper limit, I mean could Corvus really play more than 2 games with anyone without civil war?