The echoing of the three muzzle blasts and the three supersonic "cracks" created a cacophony of sound which fooled many witnesses into believing two of the three shots were close together.
You mention, "cacophony of Sound which Fooled many witnesses.................". This same claim therefore applies to Zapruder and the "jiggles" on his Zapruder Film. It is those Z Film "jiggles" which are the foundation for assigning Z Frames to each of the 3 shots. It is also these "jiggles" which NOW foster a 10+ Second duration for all 3 shots being fired. You can Not, "have your cake and eat it too".