What you really mean is that the x-rays and front of frame 313 of the doctored video show it removed.
They were both doctored but the rear is missing in frame 313. That's where the exit wound was, not on the face.
The witnesses confirm that area of exit, therefore that's where it was.
Testimony Of Clinton J. Hill, Special Agent, Secret Service
The closest witnesses saw the right rear exit as does every person viewing in it frame 313.
Clint Hill saw the rear exit, skull detach and heard Greer's revolver.
Mr. HILL. This is the first sound that I heard; yes, sir. I jumped from the car, realizing that something was wrong, ran to the Presidential limousine. Just about as I reached it, there was another sound, which was different than the first sound.
I think I described it in my statement as though someone was shooting a revolver into a hard object--it seemed to have some type of an echo. I put my right foot, I believe it was, on the left rear step of the automobile, and I had a hold of the handgrip with my hand, when the car lurched forward. I lost my footing and I had to run about three or four more steps before I could get back up in the car.
Between the time I originally grabbed the handhold and until I was up on the car, Mrs. Kennedy--the second noise that I heard had removed a portion of the President's head, and he had slumped noticeably to his left. Mrs. Kennedy had jumped up from the seat and was, it appeared to me, reaching for something coming off the right rear bumper of the car, the right rear tail, when she noticed that I was trying to climb on the car. She turned toward me and I grabbed her and put her back in the back seat, crawled up on top of the back seat and lay there.
Mr. SPECTER. You say that it appeared that she was reaching as if something was coming over to the rear portion of the car, back in the area where you were coming to?
Mr. HILL. Yes, sir.
Mr. SPECTER. Was there anything back there that you observed, that she might have been reaching for?
Mr. HILL. I thought I saw something come off the back, too, but I cannot say that there was. I do know that the next day we found the portion of the President's head.
Mr. SPECTER. Where did you find that portion of the President's head?
Mr. HILL. It was found in the street. It was turned in, I believe, by a medical student or somebody in Dallas.
Mr. SPECTER. What did you observe as to President Kennedy's condition on arrival at the hospital?
Mr. HILL. The right rear portion of his head was missing. It was lying in the rear seat of the car.
His brain was exposed. There was blood and bits of brain all over the entire rear portion of the car. Mrs. Kennedy was completely covered with blood.
There was so much blood you could not tell if there had been any other wound or not, except for the one large gaping wound in the right rear portion of the head.
Mr. SPECTER. I believe you testified as to the impression you had as to the source of the first shot. To be sure that the record is complete, what was your reaction as to where the first shot came from, Mr. Hill?
Mr. HILL. Right rear.
Mr. SPECTER. And did you have a reaction or impression as to the source of point of origin of the second shot that you described?
Mr. HILL. It was right, but I cannot say for sure that it was rear, because when I mounted the car it was--it had a different sound, first of all, than the first sound that I heard. The second one had almost a double sound--as though you were standing against something metal and firing into it, and you hear both the sound of a gun going off and the sound of the cartridge hitting the metal place, which could have been caused probably by the hard surface of the head. But I am not sure that that is what caused it.
Mr. SPECTER. Are you describing this double sound with respect to what you heard on the occasion of the second shot?
Mr. HILL. The second shot that I heard; yes, sir.
Mr. SPECTER. Now, do you now or have you ever had the impression or reaction that there was a shot which originated from the front of the Presidential car?
Mr. HILL. No.
The back of his head opens up when the red mist appears in the front.
https://www.youtube.com/watch?v=m8_hDakTz2I