Bullets from Chris too damaged etc, to match to revolvers, but was from a 22. Silver gun broken, could fire, but not quickly to match witness hearing pop pop pop. This leaves only Davidson's gun as a possible murder weapon.
In one of the trials didnt they rope off the square footage of the house in the courtroom to show the jury how small it was? That would be key in this trial to show that NO WAY that VC didn't hear anything.