Possibly, HB, but I still think the most probable cause of the marks is the Aga, the spacings are just too similar!
To me Snow it’s the most fitting and simplest explanation, Boyce was right the first time when he said it was caused by the rifle. I don’t think Bamber would want to take off his gloves and rely on a pulse check, especially when there was a better option, prodding and pushing is more faster than trying to locate the pulse, this way he keeps his gloves on and keeps hold of the weapon.
For it to be the Aga Snow you have to move away from the simple explanation and either go down the route of Neville’s body being moved by police officers so they could burn evidence, or going against medical Science, I don’t think for one minute Medical science would back up a functional Neville coherent enough to walk, talk and run upstairs and down again after hours unconscious? Recovery after such would be slow, slurred speech, unbalanced and unable to stand and confusion and possible vomiting.