Stevie ol chum...I could not care less about the specifics of JFK's hands....You have acknowledged that "the hand is in front of his chin." and the last time I checked, the throat is to the rear of the chin.....
So JFK is reacting to being hit in the photo....But Connolly is NOT......And James Chaney is also reacting to JFK being hit.... He is alongside of the Lincoln and looking over his right shoulder at JFK.
It's C-o-n-n-A-l-l-y, Walt! Not "Connolly". You can't even spell the name of the governor corectly!
Watch this GIF closely, and note where his hands are. Right hand covers the mouth, the left hand comes up directly under the right, meeting the right hand, left index finger is extended. When Mrs Kennedy takes hold of his arm and pulls his left arm involuntarily (since at the same time, she is turning her head to look at the governor) his left arm and hand remain in the same position until the fatal shot is fired. The right hand cupped over his mouth until Mrs. Kennedy takes hold of his left arm. As he turns his head to the left, his right hand opens slightly, and remains at the same height so that by the time he stops turning his head, the right hand is at cheek level, until beings it down, level with his chest. There is absolutely not one frame of the film showing him "grabbing his throat".
https://gfycat.com/gifs/detail/PopularGrotesqueIvorybackedwoodswallow The position of JFK's hands ARE in fact, crucial, because we have people like you and others making erroneous claims that his hands "clutched/grabbed/went to" his throat when they didn't!
As far as your ridiculous claims about Chaney...have at it. You are making yourself look even more foolish.