Who else was taking crime scene snaps then, apart from D.C. Bird? D.I. Cook himself? Miller? D.S. Jones? All of them?
In regard to the paint on the silencer, was there an incident simulation done to ascertain how that could have happened, with somebody pivoting a similar-sized stick around? I ask because the scratch markings just seem a bit out-of-place to me.
If we're assuming Jeremy is holding the rifle with the silencer on and he is in a struggle with Nevill, first why doesn't he just shoot Nevill? Why mess around with the rifle at all?
More fundamentally: Let's say Nevill is shot four times upstairs, then how did the struggle happen in the kitchen at all? And even if we assume Nevill could engage in a struggle, why didn't it happen before they reached the kitchen? Why didn't Jeremy catch Nevill up?
If we say Nevill makes it to the kitchen, why does he hesitate there and not go for the phone or reach the kitchen door? He must have an advantage on Jeremy if he's made it that far, and it's mere feet.
Isn't a struggle more congruent with Sheila as the killer?
Let's say Jeremy is the killer and he ran out of ammunition upstairs and that's why he's fighting Nevill. Well, Nevill is shot four times, so we still have that fundamental problem. We also have to ask, why is Jeremy holding the silenced rifle with its open end towards Nevill in a struggle? He arrives in the kitchen knowing he is out of ammunition. Why doesn't he just hit Nevill with the rifle butt or put the rifle down and just subdue Nevill, taking advantage of his injuries, and he then re-loads?
How would entering into a struggle with Nevill in such circumstances involve tilting the rifle towards the proscenium of the aga oven?
Maybe Jeremy wasn't out of ammunition and Nevill grabbed the end of the rifle barrel somehow, but why didn't Jeremy just shoot him on the threshold from the main foyer?
Maybe Jeremy couldn't because Nevill was struggling round the kitchen door, but why isn't there blood on the kitchen door and why doesn't Nevill reach the back hallway and leave blood there?
Taking all that into account, my tentative verdict about the scratch marks is, at least so far, similar to my verdict about the silencer itself on the other thread. I would say that the scratch marks on the aga look like 'isolated evidence' in that it is evidence that is not situated with the other forensic evidence of the crime scene. It's almost as if somebody has gone and put those scratch marks there, which is not to say they have, just that it seems like it.