About the Jaguar/Webber & Ferrari/Michael thing, yes that's very possible.
Just look at how Alesi and Berger performed with a car that was designed with Schumacher's driving style in mind.
On the subject of over driving, when you push the car to the limits and beyond there is obviously more component wear (engine, gearbox, suspension, brakes, tyres, drinking bottle
), it's only logical.
But that Mac does seem really fragile though...