but virtually none of the witnesses talk about the first shot sounding like BANG-BANG, very close together. That observation alone would lead any reasonable person to conclude that the last two sounds were BANG-BANG because the first shot like sound DID NOT ECHO. If the last shot echoed, then the first shot should have echoed but the vast majority of the BANG-BANG witnesses did NOT say that!
Simple and powerful argument and it works regardless of location, excellent. 
Further, if the BANG-BANG are actual shots this does not support shots fired from a Carcano.
What does it mean to us if the last two shots really were BANG-BANG?
1. Rifle found in the TSBD could NOT fire two shots less than a second apart.
That means there had to have been more than one gunman.
2. If the last two shots were fired BANG-BANG, then it probably means the US gov't investigations were flawed.
3. If the last two shots were fired BANG-BANG, then it probably means that at least some of the evidence was flawed.
4. If the last two shots really were fired BANG-BANG,
then we might see some indications in the Zapruder film:
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Login gif showing Connally a split second after JFK was shot in the head.
Showing Connally before and after this rapid movement of his head:
The two frames are about 5 frames apart which means that in about 1/3 of a second his head went from up, looking forward to being thrown forward and looking down. What could cause this very rapid movement of Connally's head?
One explanation is that this movement was caused by a rifle bullet hitting Connally. The two shots would have been 0.7 seconds apart which is consistent with what so many witnesses said they heard, BANG-BANG!
