It is almost impossible to answer mach11, unless you are actualy part of the team.
It has been bugging me to.
I do get the impresion from interviews that Schumaker is a little to complacent. It is only a feeling but he talks like a driver who is considering the job of team manager or even principle and already feels past it.
Mansel had the same thing when I talked to him at Estoril after he lost a wheel in the pits. He was different to SM in as far as being Nigel he was furious but there were the same vibes evident. Kind of blank acceptance.
I would expect any returning champion to turn in a few fast laps, it is whether there is the will to work up the team and car to achieve a constant level at the top for quali and the races.
Of course any bad results from SM will instantly reduce the potential of the other team driver, there is no doubt of that.
So IMO the question has to be, how much is the car causing the problem and how much the driver.