Look at the position of the bullet hole in Connally's jacket, it is below where the lapel terminates and above the top button.
This is an approximation of the bullet hole on JBC's jacket on the day of the assassination:
Look at the position of his wrist at z272:
Does it really need explaining that his wrist, just below the knot in his tie, is way to high to be struck by a bullet exiting his chest at this point of the Zfilm?