May I venture to say that that sounds exactly like yourself and your own reasoning. It all depends on known proveable facts about the case. Not witness statements about who said what. Bcause they all have the potential to be biased for one reason or another. Personally I am concerned about the unco-operation of the police for one thing in releasing the audio tapes of the raid team. I have an enquiring mind and wonder what could be the reason for their reluctance to reveal the contents of those tapes even to the CCRC? I have serious reservations about the whole case and the way it was handled to be entirely convinced of Bamber's guilt.
My reasoning is sound.
1) Sheila had no reason to kill anyone and was unlikely to do so
2) Unlikely that Sheila would have the capablity to commit the murders because of her lack of coordination and not being familiar with the weapon. There is no reaosn to believe she would have known how to chamber a round even let alone known how to load 11 rounds which is how many the gun had when June and Nevill were shot in the bedroom
3) The time of night makes it unlikely for Sheila to suddenly become agitated, others would not have been awake to agitate her and she had no problems sleeping at the time because her medication made her drowsy and she had been sleeping well
4) It is extremely unlikely Jeremy would find the gun in the closet with the scope and suppressor reoved as he claims
5) it is extremely unlikely Jeremy would get the rifle out to shoot at rabbits at all let alone at 9PM at night
6) it is extremely unlikely Nevill and June would have left the rifle with the loaded magazine nearby at all but especially with the twins there.
7) It is extremely unlikely Sheila would use 18-20 bullets from the stockpile Jeremy claims to have left out but go the closet to get 5-7 additional (though 30 remained in the kitchen) and also to attach the moderator

Had Sheila actually killed anyone there would have been physical evidence to indicate it because unlike Jeremy she would not have worn gloves and would have no reason/ability to dispose of evidence after her death. So she would have had blood of the victims on her, her prints would have been left in their blood (especially the blood on outside of the rifle and she coudl have touched other things thus leaving her prints on objects in their blood), she would have had gunshot residue on her clothing and hands and also elevated levels of lead.
9) No physical evidence to indicate Sheila is the one who beat Nevill though such evidence would not be concealable because it would not only include his blood on her but also damaged hands not only nails but a cut to the hand that held the stock as it broke. If she wore gloves it would not be consistent with a crazy rage but rather planned execution and such gloves would have been found but none were located ever ever
10) the notion Nevill would phone Jeremy is absurd because
A) Nevill did not trust Jeremy he told the farm secretary he believed Jeremy wanted him dead
B) Sheila did not get a long well with Jeremy so instead of calming her down he would likely cause her to shoot, indeed Nevill was the adult who had acalming effect on her so was in the best position to calm her
C) Nevill was stronger than Jeremy so physically had as good or better ability to disarm Sheila than Jeremy did
D) Jeremy had an answering machine and his phone was on the ground level. He would be unlikely to hear the phone but even if he did hwake up and go to answer the answering machine would pick up before he could reach the phone. So at best he could expect to be able to leave a message and hope Jeremy would get up and to listen to it right away instead of waiting till morning.
E) It would take Jeremy time to answer the phone, dress, drive there and find a way in so something on the order of 20 minutes. Why would he want to wait to risk being shot while waiting those 20 minutes instead of trying to disarm her and save himself or his family?
F) Sheila seeing him on the phone would likely provoke her to fire. Why would he want to risk that instead of arming himself if scared to try to disarm her with his bare hands? There were guns, knives and other potential weapons nearby.
G) The shooting started in the master bedroom as he and June were shot 11 times. There is no rational explanation how Nevill would be using the phone, have Sheila catch him and not shoot him but instead to push the button down (exposing her to being disarmed but him failing to take advantage) then march him upstairs and shoot him in the bedroom with June. If in a crazy rage she would have shot him downstairs not marched him upstairs to do it and if he went up there himself why would he leave the phone off the hook?
11) Julie's testimony is credible
12) Sheila can't have killed herself because
A) She was shot with the moderator then after dead it was removed and placed in the closet
B) She was shot seated with her back against something then dragged flat while still bleeding
C) The bible was placed in a pool of her blood that formed after her death and was opened and closed before the blood dried
She can't have done any of these things after her death the killer had to do it.
13) Jeremy lied about various things like the gun not fitting in the closet with the accessories attached and kept changing his story as necessary to try to pretend he was innocent including changing from claiming he hadn't used the murder weapon after Anthony but claiming he used it multipl times the week prior to the murder when he needed ot pretend that the scope and suppressor were routinely taken off after use.
There are other things but these are the main foundations for my conclusion that Jeremy did it and provide a well supported basis for such conclusion.