By the way, I was wondering why the Seahawks' Russell didn't make the NFL until age 24. It turns out that, after redshirting his freshman year at North Carolina St., he started three full seasons, and completed his degree (in communications, of course) while playing minor league baseball in the summers. But after three good seasons as a starter, nobody invited him to the NFL draft combine -- he's under 6 feet tall.
So, he transferred to Wisconsin (without having to sit out a year because he enrolled in a graduate program at his new school) and had such a spectacular season, 33 touchdowns and 4 interceptions and winning the Rose Bowl, that he was drafted in the third round.
Russell comes from an upscale black family in Richmond. His father was a lawyer. I believe Russell's Wonderlic test score equates to an IQ of a 114, same as Manning's. Here are Wonderlic's for active Super Bowl winners:
Here are the Wonderlic scores of active Super Bowl winners, with the mean equaling 21 and two IQ points per additional right answer.
Eli Manning, Ole Miss 39 -- 136
Aaron Rodgers, Cal 35 -- 128
Tom Brady, Michigan 33 -- 124
Peyton Manning, Tennessee 28 -- 114
Drew Brees, Purdue 28 -- 114
Joe Flacco, Delaware 27 -- 112
Ben Roethlisberger, Miami (Ohio) 25 -- 108
These guys probably study up for the Wonderlic, which boosts their scores, but still, it seems plausible that a 3-digit-IQ is an advantage for 21st Century NFL quarterbacks.