@1NJParent: UChicago’s ranking didn’t change as a result of “playing the EA/ED game”, as you call it. Not sure what “ranking advantage” you’ve seen to date, deserved or otherwise. Also, UChicago has had loads of early applicants relative to other schools for a long time, not just after introducing ED last year.
There is a point to be made that UChicago’s secrecy for the past several years regarding its early pool is deceptive - but that’s not the point you are making. Get your facts straight first - THEN make your point.