Bob Jackson is 92 and living in Manitou Springs, Colorado. Why don’t you ask him yourself? Ask him how well he remembers the spacing of the shots.
If he didn't recall the shooting correctly at the time it happened, what reason is there to think he would get it right almost 63 years later?
Why is that a question?.
Because Roger Craig was a nutcase.
How does your speculation about what the shots sounded like prove anything?
It doesn't nor do the divergent recollections of the people you cited. Eye and ear witnesses don't prove anything unless you can corroborate their recollections are accurate. The Z-film would be a good place to start but that tells us a story different from the one you would rather believe.
His estimation of time is likely poor.
Yes it is, an indication of how badly witnesses can recall an event. If witnesses could reliably recall an event, there would be a clear consensus among the ones you cited but that is clearly the not the case. They vary greatly in their estimate of how closely spaced the last two shots were. But you think that because they all agreed that the last two shots were closer together than the first two, it somehow establishes that as a fact, even though there were other witnesses who said the shots were evenly spaced and still others who said the first two shots were closer together. None of these opinions prove anything except that relying heavily on witnesses is a poor way to determine what happened.
But even a first shot 9 or 10 seconds before the head shot, which is what you are suggesting, puts the second shot no earlier than z258 according to Sweatt.
So you cite one more unreliable witness to make your point. Why?