If I argue that SC would not have been able to fend off Nevill, then it could be said if he couldn't land a blow on Jeremy then it's very conceivable, that given the early wounds he suffered, that he wasn't in any fit state to land a blow of any significanceon any person.
Then if we believe JB over the phone calls, then we have a reasonable fit Nevill, knowing Sheila has the Anschutz and has "gone berserk"...comes out of his bedroom, with the possibility that Sheila has already shot the twins and may have alreafy shot June, gets to the phone and makes the calls, then goes back upstairs to be shot without laying a finger on Sheila.
If it was JB why did he bother with the phones calls.Do the murders, get back to Head St.Back to bed.Claim he had business in town. Wait to be told. He's not stupid, so why did he,if it was him, complicate the whole thing with the phone calls. All kinds of issues about timing come into it. Police would be very suspicious as well. Think he thought the Nevill call to the police would seal the deal. Was he/is he so arrogant that he thought could put up this front and fool everybody.
Again would he be so stupid as to leave the sound moderater lying about. He must have known the thing would be contaminated as he had shot people at almost point blank range.
Again would he be daft enough to tell Julie what he intended to do. All been said before I know but as the case is on it's last legs I can't see JB getting out anytime soon.May be he is where he deserves to be.