Your scenario is impossible.

It's not the evidence that tells you JFK was struck by the first shot. That's the voices in your head telling you that.

• T.E. Moore (24 H 534, "President KENNEDY had reached the Thornton Freeway
  sign, a shot was fired and Mr. MOORE observed the President slumping forward in
  the Presidential car.")
• Nellie Connally (4 H 147. "I turned over my right shoulder and looked back, and saw
  the President as he had both hands at his neck.")
• David Powers (7 H 473: "I noticed then that the President moved quite far to his left
  after the shot from the extreme right hand side where he had been sitting. There was a
  second shot and Governor Connally disappeared from sight and then there was a third
  shot which took off the top of the President’s head")
• Gayle Newman (19 H 488: "President Kennedy kind of jumped like he was startled
  and covered his head with his hands and then raised up. After I heard the first shot,
  another shot sounded and Governor grabbed his chest and lay back on the seat of the
  car")
• William Newman (19 H 490 "The President jumped up in his seat, and it looked like
  what I thought was a firecracker had went off and I thought he had realized it.")
• John Chism (19 H 472 “When I saw the motorcade round the corner, the President
  was standing and waving to the crowd. And just as he got just about in front of me, he
  turned and waved at the crowd on this side of the street, the right side; at this point I
  heard what sounded like one shot, and I saw him, "The President," sit back in his seat
  and lean his head to his left side.”
• Faye Chism (19 H 471 “As the President was coming through, I heard this first shot,
  and the President fell to his left.”)
• James Altgens (7 H 520. He said his z255 shot was after first shot and before any
  other. It shows JFK reacting.)
• George Hickey (CE1024, 18 H 761. Perhaps 2 or 3 seconds elapsed from the time I
  looked to the rear and then looked at the President. He was slumped forward and to
  his left, and was straightening up to an almost erect sitting position as I turned and
  looked. At the moment he was almost sitting erect I heard two reports which I thought
  were shots and that appeared to me completely different in sound than the first report
  and were in such rapid succession that there seemed to be practically no time element
  between them.”)
• Sam Kinney (CE1024, 18 H 731. “As we completed the left turn and on a short
  distance, there was a shot. At this time I glanced from the tailights of the President's
  car that I use for gaging distances for driving. I saw the President lean toward the left
  and appeared to have grabbed his chest with right hand. There was a second of pause
  and then two more shots were heard”).
• Paul Landis (CE1024, 18 H 758. Saw JFK move in response to first shot but thought
  he was just turning in the direction of the sound. Landis began to scan crowd,
  buildings and car before second shot was heard. He recalled only two shots.)
• Cecil Ault (24 H 534. Viewing from court house on Houston. Reported to have seen
  JFK rise up in his seat after first shot.)
• Harold Norman (3 H 191. “but I know I heard a shot, and then after I heard the shot,
  well, it seems as though the President, you know, slumped or something,”)
• Malcolm Summers (Affidavit, 19 H 500 “The President's car had just come up in
  front of me when I heard a shot and saw the President slump down in the car and
  heard Mrs. Kennedy say, "Oh, no", then a second shot and then I hit the ground as I
  realized these were shots.”)
• Mary Moorman (Affidavit, 19 H 487, “As I snapped the picture of President
  Kennedy, I heard a shot ring out. President Kennedy kind of slumped over.”
• Jean Newman (Affidavit, 19 H 489, “The motorcade had just passed me when I heard
  that I thought was a firecracker at first, and the President had just passed me, because
  after he had just passed, there was a loud report, it just scared me, and I noticed that
  the President jumped, he sort of ducked his head down and I thought at the time that it
  probably scared him, too, just like it did me, because he flinched, like he jumped. I
  saw him put his elbows like this, with his hands on his chest.”)
• Charles Brehm (Dallas Times Herald statement, Nov. 22, 1963 “The witness Brehm
  was shaking uncontrollably as he further described the shooting. ‘The first shot must
  not have been too solid, because he just slumped’.”)
• Pierce Allman, (WFAA radio interview, in which he statyes that he thought “the
  President was ducking from the first shot”)

So unable to provide a quote to support your assertion you use the kitchen sink approach and dump a whole lot of documents and expect me to go through them to find the quote that you claim exists. Specifically, in which of those documents does the FPP doggedly deny there was missing frontal bone?

You have danced around the issue so much I don't even know which side you are taking.

Do you side with the FPP who you CLAIM denied there was missing frontal bone or with McDonnel and Angel who said there was?

So are you saying a missed aimed shot followed rapidly by a shot without further aiming also has to miss? Why?   Any scenario that happens is always improbable. 

The evidence tells you whether it happened. The evidence says that JFK was struck by the first shot; that the last two shots were closer together and the head shot was the last shot.