You are right.  We don't know if he was grimacing at z224.  We also don't know that he wasn't reacting like that during the second or so he was behind the sign.  Your common sense then is to assume that he wasn't.  Your "common sense" is to assume that it was just an amazing coincidence that the first time he grimaced was the first frame when he came into Zapruder's view. I suggest that your definition of "common sense" is not all that common.There is no evidence that JFK's reaction is a reflex.  A voluntary reaction will take at least 100 ms. to occur after the stimulus. A reflex reaction takes much less:  15-50 ms to start after the stimulus. So if JFK was shot at z223-224 as you suggest his reaction at z226 would not be a reflex.

We can argue about whether JFK and JBC are exhibiting a reflex or cognitive response. What is unmistakable is that they are both reacting at precisely the same time and in the same manner by suddenly flipping their arms upward just 3 frames after we see JBC's jacket bulge outward. You want to write these events off as if they are coincidences. Another glaring example of how bad you are at weighing evidence.

Like everyone else, I have puzzled over what happened to the three audible shots of 11/22. There may have been inaudible shots (simultaneous shots, or shots from a rifle with a silencer). Some witnesses heard four shots, but the most common account is "bang....bang-bang."

It does seem unlikely the TSBD6 sniper would miss the entire limo, and moreover the shot that hit a concrete curb hard enough to cause a fragment to chip off and cut James Tague's face is usually left unexplained.

The SBT-LNT theories are only theories, after all.

My best guess is first audible shot hit JFK, the second hit JBC, and the third JFK, as recounted by the Connallys, and which, in my layman's view, is seen in the Z-film.

I understand other JFKA buffs have different views.

Caveat emptor, and draw your own conclusions.
 

We see JBC reacting to the first shot at Z164 just as he said he did and JFK is clearly not struck so it stands to reason that the shot didn't hit either of them. Almost immediately after they both reappear from behind the sign they both react by flipping their arms upward, after which JFK leans over to his left and JBC turns and dips to the right. Both have obviously been shot at that point. There is no evidence of any shots fired other than those fired by Oswald's rifle. There is no medical evidence of any shots fire from any direction other than behind the the two victims. There are no eyewitnesses who saw a gunman anywhere except the 6th floor sniper's nest. Why the hell would anyone believe there was a second gunman and why would they reject the SBT which is actually the Single Bullet Fact. It is the only plausible explanation for the wounds to JFK's torso and all of JBC's wounds. It did not require a magic bullet. It is the only explanation for those wounds ever offered that does not require magic bullet.

Poll shows uneducated non-Democrats to be more prone to conspiracy thinking? Gotta be rigged, eh?

That is the case in my home state of Ohio. Governor Mike DeWine. a long time RINO, has created a moratorium on executions. He is on record as opposing the death penalty. There are currently 116 prisoners on death row. Vivek Ramaswamy, the favorite to win the governorship this fall, has said he will unblock the back log of death sentences. I doubt he will get the chance. I'm betting DeWine will commute all of those death sentences on his way out the door. Governors in other states have done that in the past and I fully expect DeWine to follow suit.

The Supreme Court only hears about 100 cases per annual session. After the least educated 29 of 30 states' voting majorities voted for
some more Trump in the White House, in November, 2024, Trump monopolized the Supreme Court docket with the best frivolous appeals
OPM could buy, along with his numerous attempts to have DOJ lawyers or the Solicitor General represent him personally in Supreme Court arguments
 in a parade of attempted unitary executive power grabs than he had during his first term in the White House. Imitating Trump,
"No one thought I could monopolize the Supreme Court's docket as 47th POTUS to an even greater degree than I managed to do,
2017 - 2021.

One more "objective" one. Even if I'm just recounting these for myself, I find them infinitely more interesting and potentially of vastly greater significance than who shot some sleazy politician six decades ago. They fall into the category of what are called After-Death Communications, or ADCs, a category that includes a wide variety of phenomena. My introduction to these phenomena occurred after the death of my father when I was 21. In the only time I ever "heard" from him postmortem, he delivered, unmistakably in his voice, a simple six-word message that pretty much says it all: "I'm dead but I'm not dead." Those were the most important six words of my life.

Anyway, this is my most recent, just a few years ago. I had run an ad on Craigslist for someone to housesit our cats when we went on trips. The only response was from an older woman named Victoria. She was kind of a rough and down-on-her-luck character whom my wife really didn't like or trust, but she and I hit it off. Because she was down on her luck, I grossly overpaid her - $20 a hour to sit and play on our computer and feed the cats. We had only short personal conversations each time my wife and I left and returned.

One day, Victoria asked me "Did you buy any new little cats?" I have on the wall of the living room a display cabinet with about 100 little cat figurines that I have accumulated on my travels. She added, "I always look to see if you have any new ones." This became "our" bond, and I would show her if I had anything new.

I called to schedule with Victoria and was astonished to be told by her sister that she was in a hospice with an inoperable brain tumor and probably had only days to live. Our bond was strong enough that she had asked her sister to cover for her if I called and to ask if she could still sit for us if she recovered. I said of course she could - but she in fact died almost immediately.

Shortly after her death, my wife and I were preparing to go to lunch. She was in one bathroom taking a shower and I went into the other to take a shower. When I came out and walked into the living room, still draped in a towel, I was astonished by what I found. Not unlike my wife's teddy bear described above, one of the cat knick-knacks was sitting right side up smack in the middle of a rug, well away from the wall cabinet. It had absolutely, positively not been there when I went to take my shower.

But this was not just any knick-knack. It was a cat-shaped tea bag caddy that had been propped against the back of the cabinet with several figurines in front of it. Every time I got near it, it seemed, I knocked over one of those figurines. Not this time. All the figurines were untouched. On top of which, the cabinet sits above a five-foot bookshelf with decorative rocks on top that surely would have broken the tea caddy if it had hit them. I could not even fathom how this thing had got to the middle of a rug several feet away, sitting upright to boot, unless it had been carefully "floated" out of the cabinet. "Victoria!" immediately popped into my mind. She could not have picked anything in the entire cabinet that would more clearly have sent the message "This is not normal. This is something weird."

WAY more significant than whether LBJ and the CIA whacked JFK? I think so. WAY more significant. Multiply this ADC by 100,000 others like it, and it's WAY WAY more significant.