I, too, have found the evidence about Paul's blood confusing. I don't have the time to read the whole transcript slowly and thoroughly enough to digest it properly so I haven't taken it all in. It does seem the French were very slack with their autopsy procedures, but I think it has been established that it is more likely than not that it was Henri Paul's blood that had a blood alcohol level which was about twice the legal limit and which would have impaired his ability to drive at speed through the tunnel while trying to outrun and/or avoid the paparazzi.
I think the behaviour of the paparazzi is quite appalling, and laws should be drafted to stop them chasing moving vehicles on bikes and other vehicles and buzzing around them like a disturbed nest of wasps flashing blinding lights at them. Apart from being grossly irritating this behaviour is obviously dangerous. Driving is hazardous enough without that sort of added challenge.
Who is responsible for the collision? I think the paparazzi's reckless behaviour is partly responsible, but Paul wasn't forced off the road by one of them, he was trying to get away from them by driving faster than them. He did not have to do that, and I think his decision to drive at speed after consuming what he would have known was too much alcohol, makes him responsible. He was driving way too fast for the conditions - both of himself and the road - and lost control of the vehicle.
Who was responsible for Diana and Dodi's deaths? That is a slightly different question, IMO. I don't know about Dodi, but I think Diana's decision to not wear a seat belt probably killed her. I am assuming there was a properly functioning seat belt available for her to wear, and that's what they're there for: to wear to protect you when there is a collision.
I pity the jury, because they are going to have to spend a great deal of time going through this rapidly growing mountain of evidence and resolving all the conflicts in lay and expert evidence, and there are so many. Though of course there are certain questions that they need to focus on and the Coroner will no doubt give useful direction to them in this regard in his summing up.
At the moment I am fascinated by the carbon monoxide level in Paul's blood and I want to read Prince Philip's letters. I'd also like to know whether Rosa Monckton's baby is still buried in the garden at Kensington Palace.