Hi everyone.
I'm reading your posts and started to wonder about one thing: "the famous seal". What if there was another seal that let go (failed) and the driver, for some period of time, was breathing in some fumes / exhaust fumes? Maybe this was the reason why he was feeling ok before and suddenly fainted? You know, like in films when people try to commit a suicide. They close themselves in the car garage, turn on the engine and simply "go to sleep". Or people who use geysers at home to heat up water. If there is a leak and the gas flows out they don't smell it. They just go to take the shower/bath and unconsciously end up dead.
(Putting aside the actual car damages) this could also explain why Mclaren is so secretive – except driver's privacy of course.