I do understand, but I still think it's folly to compare on a teammate vs teammate basis. Then you have the job of comparing so many more drivers. But we do know the relative pace of what sauber has shown, compared to williams and renault. Given that equipment, the best way to compare would be on results. And even regardless of the car, Koba is still on top, even with all of his DNFs. And even Nick Heidfeld hasn't been able to go faster than Kobayashi, and I certainly think Nick is a pretty good driver. If there was such a large performance gap between the drivers, wouldn't we see a Klien vs. Senna type gap?
Its not a folly at all. In fact, judging drivers based on their teammates is usually the best way to go about it.
At Sauber, there's a rookie and a driver that was never that good to begin with who's also been out of racing for longer than Schumacher, so its VERY hard to be certain of anything when it comes to how good the Sauber really is. We have no idea how much better that car might look in the hands of somebody more proven. You can bring up Heidfeld if you like, but its a bit misleading to say "even Nick Heidfeld hasn't been able to go faster than Kobayashi", as obviously they've only had one race together, and it was Nick's first time in the car.
You seem to be trying to twist the facts to suit your theory, while I'm merely saying that there's big question marks over how good Kobayashi actually is. I've never said he was bad or anything, I just happen to be more impressed by a rookie that is taking it to a known quantity like Rubens at the moment. I dont care what the standings show.
Kobayashi can prove me wrong later on, but for now, its how I see things.