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.