Snow you should press the CT on this. I can't because I don't agree with your theory. But your theory is supportive of Sheila being the killer. The moving Nevill theory is hopeless because is does not undermine the prosecution case.
But I appreciate that conspiracy theorists want to fixate on alleged police malfeasance as it's their bread and butter.
Yes, the police moving Nevill does nothing to prove JBs innocence as far as I can see Jonathan!
In fact it fits in nicely with JB being the killer according to their timings.
You see, they say the burns would have taken at least 4hrs to form but possibly five or more, so this fits in with JB killing Nevill and then leaving about half past two, hence Nevill lay against the Aga for five hours before the police entered, ie.,2.30-7.30.
On the other hand, a guilty Sheila scenario only allows for Nevill lying against the Aga for 4hrs max, ie,3.30-7.30.