Today's NFL is more complex than in the days of Kelly and Marino. I mean let's not forget Belichick developed the Giants defense that shut down Kelly (and the passing game) in Super Bowl XXV.
In terms of the Wonderilic, it's debatable of how good it measures a QBs intelligence, personally I liked Nathan Peterman before hearing his score and guess being he scored high it helps with my narrative that he be a good QB but honestly only time will tell. Yet I like that he's a guy who had to find himself (left Tennessee for Pitt) and showed some intangibles in a pro style offense.