Actually the first shot was less than 50 yards from a rest with a scoped rifle. Some say that one missed and could have if the rifle were sighted in at 100 yards. From 45 yards from a rest.... I can not miss a gallon jug of water with a HANDGUN I probly would hit a gallon jug 5 out of six at 80 yards from a rest with a handgun. I am a terrible rifle shot but I could do the same with a Garand
The car was moving away slowly so that was not a factor. The scope was damaged after the shooting so marksmen had to compensate but they all did it.
We are left with.... could Oswald have made those shots? Of course he could. Did he fire 4 shots? yes he did (one miss maybe two) Could another shooter have fired from somewhere else? sure.... but we have zero evidence that happened. Anyone else shooting would have about a 3 times harder shot tho at a angled moving target. People in the building heard him fire the shots.... so he did fire em. The steel buttplate on the rifle had fibers from the shirt he wore that day.