Well that's your Conclusion Snow and your entitled to it, your also entitled to think Neville was knocked out for three hours by Sheila with a fractured Skull and left by the AGA to burn his back.
In what order do you think that Neville recieved the beating and the shot's from Shiela, was it beating and then unconsciousness, then shots upstairs, Neville comes downstairs then shots downstairs, and when do you fit the Phone call in to Bamber?
Sheila and Nevill in kitchen, Nevill knocked out,rifle stock damaged on head or Aga.
Sheila goes upstairs,shoots June,shoots boys,cleans herself up,writes letters.
Nevill comes round at 3.10,phones Bamber in a frightened daze due to brain bleed,staggers up stairs.
Met by Sheila around main bedroom door,shot twice in face,retreats,shot in arm and torso,staggers to kitchen at deaths door,slumps in chair,holds up good arm,beaten with stock and barrel of rifle, succumbs to wounds and slumps over chair/scuttle,now at rest Nevill is shot four times in head!