But you see, Adam, you're kind of going round in circles in a way!
You say JB used the silencer and shot Sheila, but then you say he couldn't just leave the silencer beside Sheila because the police would test it and find her blood in it! Fair enough, thats a good point!
But!!!! If JB had worked out that Sheila's blood may be inside the silencer, why indeed didn't he clean it before returning it to the cupboard?? Knowing that if the police found it, it may still be tested?
Leaving the silencer beside Sheila would guarantee it was taken by the police, and examined and treated as evidence. Putting it back in the cupboard reduces this. He may well have thought it was clean enough, or that removing it from the scene was sufficient. The question is…….. do you think Sheila put the silencer back in the cupboard herself?
You also have to remember, Glynis Howard reported minute staining, we’re talking fractions here and not as obvious to someone in panic and in a hurry, it is precisely the sort of size in staining someone could believe they had wiped away and he wouldn’t have known or seen the blood inside the silence.
Leaving it out makes it obvious and would demand an explanation, putting it away requires little explanation (I left the rifle out minus the silencer) it would only then become evidence if it was suspected as being used. So forget the blood for a minute Snow, someone trying to stage a scene would not leave out objects that would draw attention, the silencer laying beside Sheila would most certainly have drawn attention and raise Questions in my opinion?