Indeed. If the crime scene was staged, it was by Bamber! He is the only person who would have staged the crime scene. Sheila wouldn't and the police wouldn't move things around for absolutely no reason. It had to have been Jeremy!
So who was the officer who thought he saw the rifle across Sheila's body, or the officer who hadn't seen a rifle beside her at all ? What about the time factors there ? At the very beginning of the murders, it was noted that the rifle apparently used in the killings was 18inches away from June, who was on the bedroom floor, in fact it was practically central to where the two women were lying..