The Wonderlic may be a good measure of general real-world or SAT intelligence under stress, but has NO bearing on football smarts.
Football, as Belichick once explained, requires a completely different kind of intelligence. It is more spatial, the ability to see, interpret, and anticipate fast-moving objects very quickly, and is not measured by the Wonderlic.
It is amazing how much weight a crappy 5 minute test can have on a football player's fate.