There are 600 people working for Red Bull, it's not only one of them that's a genius...
Exactly. Look at Mclaren - a "random" (non-famous!) engineer thought of the F-duct. What Adrian Newey does seem to be a able to do (in a way that Ross Brawn does) is to galvanise a team together. It's not just him in front of a computer tho'!
EDIT: Aah! "In Mclaren, the Great Mclaren" - with bells!