I ask for an illustration and you give me abstract art.
How about just a basic drawing using simple ovals to represent JBC's head and shoulders. Use a long oval for his shoulders and a short oval for his head and show us how you think his head and shoulders were turned in relation to the path of the bullet. Then we can compare that to Z271 to see if it is even close to JBC's position at that frame. Your last illustrations was only off about 90 degrees for both his head and shoulders.
Unfortunately, the human body is more complicated than ellipses and circles. The relative positions of shoulders, scapulas, ribs and skin changes with different turning positions. What I presented was a twisted torso with the shoulders aligned with the car direction and the hips facing forward. That was his position at z271.
The impact felt by JBC is consistent with significant bullet momentum being imparted to the body suddenly. That is consistent with a forceful impact to what could only have been the fifth rib. We know the fifth rib flexed enough to cause a fracture near the spine. That same force is also applied by the rib to the bullet and that must cause a change in bullet momentum. Regardless of how JBC was turned, that would have been a force on the left side of the bullet meaning the change in direction had to be to the right. That would be the case whether he was turned forward or, as the witnesses said, sideways.