He has a goofy side , certainly .
Gronk is no dummy ( he was a high school honor student and posted a 2.9 GPA at the University of Arizona ) , and his guileless , rambunctious image is appealing to many marketers .
He has a goofy side , certainly , but Gronk is no dummy ( he was a high school honor student and posted a 2.9 GPA at the University of Arizona ) , and his guileless , rambunctious image is appealing to many marketers .