Missing the sound of one shot is not such a big thing in the scale of things ,witnesses in cases like this regularly misremember the exact number of shots but their testimony on the whole is still the most credible and I doubt very much the judge will discount it for that reason.
In any event whilst thinking about it maybe there were two sets of shots .I would like to know exactly how many bullets were left in the magazine .For all I know he could have shot out of the window to scare Reeva and had the casings removed with the phone that vanished or maybe he attempted to flush them down a toilet ,who knows really .
I will be listening very carefully to the closing arguments before making my mind up on this .
Iirc, a bullet had been removed from the chamber but the magazine had also been removed then put back in during that whole VR and Motha episode... no mention of how large the magazine was that I picked up on. Seemed kinda counter productive imo to put the magazine back in if the tech had been making the gun "safe"...