If that was the case then they were both obviously wrong in my opinion. In fact if the defense agreed to that then they ought to have been ashamed of themselves in failing to spot the subterfuge behind the so called silencer evidence. You are too trusting Adam. Remember the hearts of men "are deceitful above all things and desperately wicked, who can know them?"
Well only Bamber has claimed the silencer was not used. He has to.
Focusing on it after his 1989 appeal failed. More tests were done and attempts to discredit the earlier tests made. Which all just highlighted it being Sheila's blood. The latest attempt being the expensive Arizona tests.
The prosecution said they had an 'overwhelming' case without it. The relatives also said there was enough evidence without it. However that didn't mean it should not be used as evidence, providing the lab results were favourable.