I think you guys are just bandying around Mclaren's performance to fit an agenda. And it's so humorous, I have seen a multitude of threads all over the internet saying Mac was the faster car after that q3 performance only because one of the Bulls didn't pole. I saw it from Q1 that the Bulls had everything under control, they were "exploring" different ways of approaching racing - while Mclaren were desperate to get that pole for their 700th GP. The way Hamilton and Button were wringing the necks of those cars..
My technical instincts pointed to a compromise for the mclarens, and a conservative approach for the Bulls. And it turned out to be true.
And yes that was only Qualifying...
I genuinely observed that the Mclaren was lacking in the race. It doesn't matter if it was setup or some mysterious reason, they were not fast enough in Korea. What it is, is what it is. Potential doesn't count; the same car that was 2 seconds off in winter testing is the same one today, It's all about being fast when it matters, and the car was simply too slow to win in Korea. Doesn't matter how people twist it.
I even notice that RedBull actually had better tyre life than the Mclarens even though the Mclaren was the more under steering of the two. There is much for the Mclaren engineers to sort before India.