No he didn't given by his own admission he did not know the sequence of shootings.
To date a reconstruction hasn't taken place. When it does imo it will show NB was shot on the landing stairs meaning he could have made the call to JB before he was shot.
No he couldn’t have made any calls from upstairs — Jeremy had already disabled the line
So although the highly experienced pathologist obviously couldn’t give an exact sequence of shootings, due to his vast knowledge and experience, including being privy to all the FACTS, he was able to determine that Nevill could NOT have spoken after being shot in mouth.
Thus, as Jeremy had disabled the telephone line prior to creeping upstairs to shoot all his family dead, it would have been
impossible
for Nevill to have made any telephone call
As for suggesting they should do a reconstruction almost 35 years later, when not just the victims but many of the witnesses/police are possibly dead too; not forgetting the fact Jeremy was found guilty; has lost all appeals, attempts for leave to appeal, lost his appeal in the European Court of Human Rights, and has told lie after lie after lie making out he’s found new evidence which is all rubbish, why would anyone in their right mind do a reconstruction?
Even if they DID it wouldn’t prove a thing: it would all be conjecture