Total nonsense. You don't have JBC turned nearly as far as he is in Z271, when his head has turned almost 180 degrees and he is almost facing Oswald.
Just look at the Z272 frame in the previous posts. JBC is in full profile and his shoulders are about 45 degrees to the path of the bullet. Your drawing would have to rotate both JBC's head and shoulders 90 degrees to be even close to accurate.
Even with the manipulated drawing you are forced to postulate a magic bullet. The harder you try to save this turkey of a scenario, the worse it gets.
The ribs don't turn much more if one turns the shoulders so they are aligned with the car direction. Try it yourself and turn about 45 degrees, put your hand on your right ribs near the right armpit and then turn your shoulders another 45 degrees. The fifth rib barely moves. The right nipple moves a tiny bit farther right relative to the shoulder blade.
I was just giving a general idea of where the bullet path might have gone to explain the wounds. Here is the same idea with the shoulders turned much more. The problem is that I am just turning the photo rather than twisting the torso, so it gives a bit of a distorted position of the fifth rib:

Some will say that the bullet doesn't enter just lateral to the shoulder blade. I am using my own torso to locate the shoulder blade. It does not change position much relative to the right nipple by just turning the shoulders another 45 degrees or so. Try it. (My photo shows a normal forward facing person turned but without twisting the torso). I am just guessing as to how much the fifth rib flexed. It may have flexed inward more. It was a pretty forceful glancing impact and ribs are somewhat flexible. The rib did fracture at the spine so maybe I haven't shown enough displacement of the rib.
All I can say is that if JBC was hit in the chest by the second shot, as everyone says he was, the evidence from three independent bodies of evidence is overwhelming that this is very close to the time that shot occurred. So your anatomical arguments don't really work because they don't deal with that evidence.
While you are critiquing the z271-272 second shot, try explaining why the change in appearance of the wrist, as well as the movement of the left sunvisor occurs at that time (this shows z268 followed by z271 followed by z272 with a 2 second pause after z272):
