Sheila being shot while asleep in bed looks to me to be the only way that JB could have done this, but how does he get the body to the main bedroom without it being obvious? The Police and PV would have know instantly. Also why take her to the main bedroom this seems strange to me?
Yes. How I came up with the theory is that I was convinced in my own head that Jeremy is factually guilty. To an extent, that default position is still with me now. I'm inclined to think he did do it. But I was sat there racking my brain trying to figure out
how he did it.
The logistics of it - getting to and from the farmhouse.
Subduing Sheila and the risk of Sheila perambulating around.
There just seemed to be so many problems.
Together with this, I've always been intrigued by the photo of Sheila's bedroom and wondered if this was a 'dog that didn't bark' clue.
I then re-thought the whole thing and came up with a way that he could have done it, had he planned it through properly. I've not gone over how I think he could have gone to and from the farmhouse, but in regard to Sheila, ideally he would kill her first while she is still in bed, then he would leave her and kill the rest. Then he would return and clean up and move her.
The reason the detectives don't notice this is, quite simply, because he does an excellent job of cleaning-up the relevant area, which is why it looks so neat. No doubt he does leave small clues, but they are overlooked.
As for why he leaves her in the main bedroom, my explanation for that is simply that he knows he is leaving blood everywhere he goes and the main bedroom is nearest - it's just across the landing - so it's more practical to leave Sheila there than risk carrying her to the twins' bedroom. It also means any residual blood trail can be explained as spatter.
I don't believe this is how he did it, though.