Rooney, like many footballers, is the same. In interviews you can tell he's not the sharpest tool in the shed but he does have a 'footballing brain' so I'd say general intelligence and footballing intelligence are very different. I don't know if Willian lacks the footballing brain or if he's just not confident enough to take the riskier option (be it a through ball, shot, etc.). His statistics have been poor throughout his career though.