Okay, I actually sat down last night and looked at the autopsy photos again and the Zarpruder film and some of the stuff posted here.
I believe the entrance wound and the exit wound are the same wound. In other words the bullet hit him on the right side of the head above the ear and ripped away the skull cap area there.
If Oswald had hit him in the back of the head the exit wound would have been on the left side of his head. There would also be an entry wound in the back of his head and there isn't. The only entry wound in the back is the one near the neck and right shoulder, the first shot.
Now, how does this theory affect the "badgemen" or grassy knoll shooter? Same common sense. The exit wound would have been on the back left of his head and there would be a small entry wound on the right side of his head up high. It is impossible for this shot to have been entrance and exit at the same time because of the angle.
I ask the grassy knoll theorists, where is the damage to the left back of his head if a bullet from the right and in front of Kennedy hit him? You can't even claim that the bullet took off the top of his head. The damage is clearly on the right.
Kennedy was already slumping forward and towards Jackie from the first wound. That is clear as day. This gives Oswald the perfect angle for the kill shot to tear off that portion of the skull cap. It makes the shot from the grassy knoll impossible. It absolutely cannot be done. That bullet would have had to hit the limo, Jackie, or the ground near Jean Hill and Mary Moorman. No such evidence exists.
And again I ask you to think forensics. If JFK were surrounded by white walls, based on the Zapruder film where would the blood spray be? In front of him mostly.
I challenge anyone who can shoot to create that blood spray going backwards effect using a melon and have none following the trajectory of the bullet. On top of this the limo was moving forward so the spray backwards from a grassy knoll shooter is even more suspect.
Folks the blood and whatever the white matter is in the film is following the trajectory of the Oswald bullet. That is the point.
Oswald could have been a hired gun, but he was the hired gun and the only hired gun it could have been. At least the only one who hit the man.