Let's not ignore Kellerman as a witness...
Kellerman was the head SA on site that day...
He used the word "flurry" twice in his testimony...
He was actually sitting in Kennedy's limousine when JFK was shot...
Those facts alone should weigh Kellerman's testimony heavy in the balance...
Kellerman never said he heard more than three shots. He used a vague word like flurry that you are trying to make something out of.
Of all the jamming square pegs into round holes that Ct's do one of my favorites is trying to build up a witness to make it seem like he could not be wrong. In this case you are doing it by claiming that Kellerman being the head SA on the site that day is supposed to mean something regarding his reliability about how many shots were fired. Like being head SA has anything to do with it. LIke they have training in that or even if training for that would be possible. CT's do the same things with the cops who were near. Like a cop has to be more reliably than anyone else there about exactly what happened.
They also do it if someone was close to the limo like whoever is the closest should be considered the most reliable.