The role of a visionary on a creative project is an essential and demanding one.  Many companies that consistently produce great products owe much of their success to their visionaries;  Apple has Jobs,  Pixar has Lasseter,  Nintendo has Miyamoto, etc.  But visionaries are nothing without talented teams to realize their vision.  Vision needs to be communicated, reinforced, inspected and adapted to the emerging reality of the game.  This is the visionary’s fundamental responsibility to the team.