I find the comment by PC John Manners interesting where he states "Mrs Bamber was clothed in a nightdress.... I remember that the blood on her legs was smudged as if she had been dragged by the legs"!
So we have NB perched on an overturned chair with his head placed in a coal scuttle, SC "staged" in a most obvious way, in a "not quite right" position next to the bed (on a non-bloodstained rug), and now a suggestion by Manners that June appears to have been dragged across the floor.
Why would JB (or SC) do these things

In my mind (and my mind like everyones is limited) I can only see the murderer shooting them and then leaving them dead in the position they were killed.
All this "repositioning" is very disturbing