Swordmaker, not knowing either individual personally, all I can say is I have serious doubts as to whether or not CholeraJoe is a physician. As for Ophiucus, I missed his posts on the subject, so cannot comment. However, any bona fide physician worthy of the title who looks at the following still from the Zapruder film and still claims the head wound was caused by a frontal shot is someone who, at best, must have been dead bottom of his class in medical school.
Physical evidence is a funny thing. It speaks for itself no matter who says what, and who tries to twist things in order to make a buck off other people's tragedy. In this still, we see the upper right side of Kennedy's head blown apart. The autopsy x-rays show that part of the president's skull mostly missing, and what remains of the skull fractured in many places due to the explosive force of the bullet exiting out the right-front of the skull. We have frontal and side autopsy photos that show the shattered right front of the skull.
All of this material speaks for itself. Although, several times, I invited CholeraJoe to describe the injuries clinically, the fact is the material doesn't need an explanation. Certainly not from anonymous individuals posting on an internet forum, claiming to be physicians, and yet failing to explain clinically what they see in these materials. And no, claiming these materials are "faked" simply will not do. That's the fallback position of a charlatan.