Mark webber proves its not just the car.
First off, nice new signature!
Secondly, I personally think Mark Webber is evidence of the need for a car to be appropriate for the driver, Jenson Button is perhaps a better example.
I think the car needs to be right for the driver for the two to work. All drivers have their own style of driving and setup requirements, but if a car is developed towards one driver, there is a chance that no2. driver will suffer because the car will not move in their style of driving.
So, depending on how you view it, there is an argument for both sides in isolation. You could say it is all car as a driver needs a car to work for him, but equally you could say it is a lot to do with the driver, as a car needs a driver to set it up correctly for him to drive it well.
On his day, with the right car, the right conditions and the right track any driver can be unbeatable. Jenson button is a shining example of this as when he hits all the notes, he is fantastic to watch. Give him a car that is not quite in his comfort zone....he seems to fall apart. Give a car that is not quite right to Alonso, Hamilton.....they seem to be able to pull something extra out of it.
So in short - I think it is a lot to do with the car, but there are a few drivers that can take a car that doesn't work for them, take it and drive it to points in a race. These are the are the truly great drivers. These are the guys that can eek out that extra few tenths that others cannot. They are the drivers that make a difference to the car.