So you are saying that it's not possible to later challenge through the courts a pathologists findings.. because 'the pathologist was working from the body and not just from photographs'.
I think you are making this up as you go along. Your adherence to original experts' findings is like some blind-spot adoration.
Why do you think when Rivlin QC examined Prof Knight the first thing he did was confirm with Prof Knight that he did not have the benefit of seeing the bodies and was working from photos only?
Had anyone thought the case was contentious at the time the defence may well have instructed a pathologist to reexamine the bodies but was too late as by the time it turned the bodies had been cremanted.
I am simply going along with how the courts will view all of this now.