it's hard to see any correlation between the score and onfield production or even film room breakdown
drew and peyton are 2 of the smartest qbs ever and they both had 28s
marino 16
kellly 15
The wonderlic is just as relevant as any other measurement given (40 time, height/weight, etc.).
It's not a predictor of success like any other measurement. But they all are tools that provide a point of data in conjunction with their film to give front offices more complete information on projecting players to the pro level.