Nobody would know if they were simultaneous, especially if there was a silencer in use. The entire case hinges upon acoustics, which are irrelevant in the echo chamber of Dealy Plaza, and also irrelevant if a silencer was in use.
The number of shots heard is not important. It's the number of wounds caused by bullets, and there were more than two. Oswald could not have shot 3 times in 5.6 seconds and hit anything except maybe on the first shot. What people saw, what the doctors saw far outweighs sounds.
It is as if the commission made a hypothesis and set out to prove it, rather than letting uncomfortable facts speak for themselves. A pretty silly and fouled up investigation. > 50% of the evidence suggests multiple shooters. Forget how many shots were "heard."
THREE very disticnt shots were heard in/about the TSBD building - you are advised to review this Affidavit witnessd by several ear witnesses only ONE FLOOR below the shooter:.
Substance of Harold Norman affidavit:
About 12:15 P.M. on this same date, after I had eaten my lunch, I went to the fifth floor of the building to watch the parade of the President pass the building. Bonnie Ray Williams and James Jarman, who also worked at this building went with me. We took a position in the south-east corner of the building on the fifth floor and I was looking out the window which is closest to the east end of the buuilding overlooking Elm Street.Note: The floors of the TSBD building are wooden.Just after the President passed by, I heard a shot and several seconds later I heard two more shots.
I knew that the shots had come from directly above me, and I could hear the expended cartridges fall to the floor. I also could here the bolt action of the rifle.
I saw some dust fall from the ceiling of the fifth floor and I felt sure that whoever had fired the shots was directly above me. I saw all of the people down on the street rut towards the west side of the building, so I went to that side with Williams and Jarman, and looked out the west side window. We discussed the shots, and where they had come from and decided we better go down stairs. We walked down the stairs to the first floor and did not see anyone else on the stairway as we went down. From the time of the shots until we started down-stairs was about five minutes.