Yes it does seem ludicrous which is why it’s on Andrew and not us, to prove this Z190 and Z270 shot , beyond just his drawings and words which is why I suggested that it would take an experiment to overcome the many logically deduced criticisms that you and I and others have posted in this thread.
I've gone around and around with him pointing out the flaws in his theory but he still clings to it. It seems absurd on the face of it and gets even more ridiculous the deeper you dive into it. He has an infatuation with certain eye and ear witnesses as if they are empirical evidence of what happened rather than looking at the much more reliable hard evidence available. The Z-film is a better witness than all the human witnesses combined. It has told us within a few 18ths of a second when the second and third shots struck JFK. The evidence for when the first missed shot was fired is a little less definitive but I believe there are very strong clues for that although not everyone agrees with my assessment. Combining the Z-film with the recovery of the bullets, the shells, the rifle, the rifle bag, fiber evidence on the rifle and the bag, finger and palm prints prove beyond any reasonable doubt that Oswald fired the shots that killed JFK and seriously wounded JBC. Andrew chooses to ignore the solid evidence of the SBT and invent his own lone gunman scenario which makes absolutely no sense. I'm done pointing out the flaws in his scenario. He continues to believe he has discovered something that armies of researchers, both LN and CT, missed. He is a cult of one and it is going to remain that way. In 35 years of debating the assassination online, I've never come across anyone who believes a scenario even similar to his. I will confess that when I was a newbie to the discussion way back in 1991, I tried to come up with a similar lone gunman scenario that didn't involve the SBT. I think I had JFK hit sometime in the Z180s, JBC in the Z230s, and of course the Z313 headshot. Finally, I had to give way to common sense and admit to myself that there were way to many flaws in what I had pieced together to continue believing it. I realized the SBT is the lynchpin of the lone gunman theory. Without it, there had to be two shooters. However, we don't have to do without it. The SBT has stood the test of time and all efforts to tear it down.
I doubt Andrew will ever let go of his theory. If he was going to do so, he would have done so by now. I first came across it on John McAdams' forum way back in 2008 and I don't know how long he had been pushing it then. Nobody was buying it back then and nobody is buying it now, but he keeps on trying to sell it without success.