At least where I come from, a GPA is far from a perfect indicator. It's quite easy to take a bunch of junk classes and get a perfect GPA at one institution, yet someone smarter may have to scrape by with a B in one of the top universities. Toughness of grading/curriculum is a huge variable in this. That's why for lots of the most competitive secondary entry or professional programs, GPA matters, but not that much.
Are we still on the subject of race here? I was reading through, and it almost felt like it was "which race has the biggest dick". I mean, penis length describes sexual prowess as much as an intelligence label describes mental ability