Most people assume that quarterbacks have to be the smartest guys on the football field. After all, they run the offenses, they have to keep track of plays, read defenses and make the right choices to score. However, evidence shows that they're NOT the smartest guys on the field.
The real answer? Offensive linemen. Yes, the big guys up front. It seems that all they have to do is mindlessly block for the QB or the running back, right? Wrong. Turns out that they have to be smarter than most of their teammates. Experts consider that they have the hardest job. They have to adjust to many different fronts, understand blitz concepts, recognize patterns and communicate with one another in extremely fast fashion. If you saw The Blind Side, you'll know that O-linemen tend to be the highest paid players, and with good reason.
There's real evidence to back this up, too. Before any player goes in for the NFL draft, they have to take a 12-minute 50-question test called the Wonderlick. Think of it as the SATs for Pro Football. On average, Offensive Linemen tend to score higher than everyone else!