It is not unreasonable to dismiss the 75% (if that is the actual number) when they are demonstrably wrong. Many of that 75% thought the last two shots came right on top of each other which is not possible with a bolt action rifle and all the physical evidence indicates all three shots were fired by Oswald's bolt action rifle. Large numbers of people can be fooled by the same phenomenon. We can only speculate why a large number of people got the spacing wrong because we don't know what they actually heard. I suspect many of those people heard two sounds from the final shot, which is a recognized phenomenon. There were many earwitnesses who did not seem no recognize the sound of the first shot. If those same people heard a double sound from the final shot, they could easily be fooled into believing the last two shots were close together. JBC's visible reaction at Z164, the simultaneous raising of the arms of JFK and JBC at Z226, and the obvious head explosion at Z313 give us a good idea as to the spacing of the shots. What we don't know is how quickly JBC reacted to the first shot by looking over his right shoulder. Dale Myers has hypothesized a shot as late as Z160. My own belief is the first shot was fired at Z147-148 followed by a noticeable camera jiggle at Z155. Tom Graves believes it was fired about a half second before Zapruder resumed filming. Without definitive proof, there is no way to say who is right, but under two of those scenarios, the first two shots would have been closer together while under the Graves scenario, they would have been almost evenly spaced, with the last two shots coming only marginally closer together than the first two.

Uh Oh Uh Oh . . . . .

This strikes me as playing dumb about Oswald's Agent Provocateur status which explains all of your pretend conflicts the best of any explanation...