You do realized that at z271 JBC's right side is "facing" toward the TSBD/Oswald.
Yes it is which makes a shot into his back impossible at that frame.
I hope you realize that the right armpit is on the right side and that with his right arm up and in front of his chest the right armpit is exposed to a shot from the direction of the TSBD/Oswald.
The front of his right armpit is exposed to Oswald. That's not where the bullet entered. The bullet entered at the rear near his right armpit. That is turned away from Oswald.
The right scapula is not "facing" the TSBD/Oswald although the right edge of it is exposed to a shot from that direction. It is "facing" the grassy area between Elm and Main. In any event, he was not hit in the scapula.
When's the last time you had your eyes checked?
The back of his armpit is turned toward the grassy area between Elm and Main.
I am not sure what you mean by the direction the back of his armpit is facing. The back of his armpit is a particular location.
So now you want to quibble about semantics. OK. I can play that game. The back of his right armpit is EXPOSED to the grassy area between Elm and Main. It is not even close to being exposed to Oswald's gun. At Z271 JFK was leaning hard left from the position he was in at the time he was shot. That would mean any shot by Oswald directed at JBC would come over JFK's right shoulder. There's no way a bullet on that trajectory is going to enter his back near his armpit.
It doesn't face anywhere. What matters is whether the back of his armpit was exposed to a shot from Oswald's rifle.
It doesn't. Not even close. JBC's torso would have to rotate at least 90 degrees counter clockwise to make an entry in his back near his armpit possible.
Not only was the back of his armpit exposed = the entire armpit was exposed.
Both sides of that equation are ludicrous.
If you think it wasn't, what on earth could have blocked it?
The FRONT of JBC's torso. That is what is exposed to Oswald. He could have hit the outside of JBC's right arm with a grazing shot. No way to enter anywhere on JBC's back. Why do you keep lying to yourself by telling yourself that could have happened.
I have given you the diagram showing the exit location.
The exit location has never been in dispute. It is how an entrance wound in the BACK of JBC's could have been made by a shot from the sniper's next at Z271. That is the impossibility.
What more do you need? It shows the bullet coming from the TSBD/Oswald direction. It shows the direction of the shoulders. It shows the location of the entrance and exit wounds. It shows the location of the forearm in relation to the exit wound.
I don't know which diagram you are referring to. The one that looks like an abstract art painting or the earlier one in which you have JBC rotated 90 degrees counter clockwise from his actual position at Z271 and even then you needed a magical deflection of the shot to have it come out the right side of JBC's chest.