This could have been discussed here at some point, but I haven´t seen it.
My question is this, when Jeremy had to use two shots to kill Sheila, why did he stage her death as a suicide? It could have been his plan originally, but why didn´t he abandon that plan when he had shot her twice? What killer would shoot their victim more than once, then expect that, yeah, I´ll make it look like she killed herself!
Why stage the Bible, why hide the silencer, why fake the phonecall from Nevill, thereby narrowing the possible culprits down to Sheila and himself? Why not keep it open to more than those two by NOT staging a suicide?
All this comes across as impossibly stupid!
I keep thinking that the chance to stage the suicide simply presented itself, I'm not sure how JB could be confident of being able to stage it from the outset.
The first shot wasn't enough to kill her, or maybe it was but knowing the difficulty he encountered and number of bullets required to kill the other victims, he ended up firing a second bullet to make sure.
He may have expected that the police would assume the two shots occurred because the rifle was a semi-automatic, and thus suicide would be believable (he was quite correct initially).
The phone call, etc was both his method of control and also his alibi, or so he had hoped. He clearly thought he was being clever, he very nearly got away with it.
If no staging took place, then JB would have been a suspect from the outset, especially with the inheritance side of things.