If he had not been speeding he wouldn't have hit the car, or been involved in any sort of accident at all. He would still have been behind the car he overtook
That car didn't hit the turning car
I have no idea, nor do you, what the other vehicles on the rd involvement was. we can assume no other cars were involved, but that is all.
Therefore had he not overtaken, there would have been no accident
He didn't overtake illegally. that was established upthread.
I'm really do wonder how you can't see that
because it means nothing?
I don't think anyone can dispute that the big picture message that is the purpose of this videos release, is a general one. yet still people here have been arguing that in their opinions, bikers die because they go too fast and that car drivers, even when they are in the wrong...aren't in the wrong 
Even when presented with facts and statistics, that show something very different than you and many people here believe, you are still arguing?