In a machine as complex as the videogame business, importance is a hard thing to pin down.
You could argue that every artist, engineer, designer and tester is a vital part of the mechanism. And yes, much of the innovation in games does get credited to the wrong people - those with the biggest profiles rather than brains.
But there's no mistaking vision. The people who set themselves apart - who really change things - do it the hard way. They suggest the things that don't obviously make sense; they ask questions that no one wants to answer; and as they announce their ideas to the world, they stand alone before the cynics.