The thing that always impressed me was the statements of the railroad workers on the overpass who went down behind the grassy knoll because they saw or heard a shot come from there. I have seen their statements on You Tube. Other people thought the same thing. Was it an echo or mass hysteria that so many people looked or went to that area.
No matter what we believe today or tomorrow, there has been so much conspiracy theory, many would not believe a story now if the participants went on national TV and gave a blow by blow description. It's easier for our sanity to believe that one guy did this. But it was very difficult to believe the Warren Report, especially because it requires trusting LBJ, Hoover, and Spectre. Now that's a case that's hard to close.
As far as the timing of the shots, I say it took 52 seconds to load and take three shots. The first loading and shot took 43 seconds because there was no hurry. Then the rest took 8.3. I agree with those who point out the first load is not part of the time frame. The info on the Italian test doesn't address the first load issue.
Lastly, there was show on Discovery or History which traced Oswalds steps from the building to the theatre. Many have said he couldn't have made it. But the demonstrations proved that he could have. Whether or not he killed the cop, he could have travelled the route. So it looks like no car or pick up by another person.