https://history-matters.com/archive/jfk/hsca/reportvols/vol1/html/HSCA_Vol1_0023a.htm

Mrs. Connally had the best seat in the house (pardon the flip expression) when it came to injuries sustained by her husband, Gov. JBC on 11.22.
Mrs. Connally's testimony flatly contradicts, and really obviates, the SBT-LNT theorizing.
After being shot, JBC was incapacitated, and she thought him "dead."
I rather suspect a man shot through the chest with a large high-powered slug would in fact be incapacitated. That is a reasonable assumption.
The SBT-LNT hypothesis is that
after being shot through the chest, JBC makes a 180-degree turn in his seat to check on JFK. That is, the SBT-LNT theory posits, despite contradictory evidence, that JBC was shot ~Z-221.
The SBT-LNT hypothesis does not check out with the Z-film, or the testimony of both Connallys.
Connally: I was knocked over, just doubled over by the force of the bullet. It went in my back and came out my chest about 2 inches below and the left of my right nipple. The force of the bullet drove my body over almost double and when I looked, immediately I could see I was just drenched with blood. (1 HSCA 42)My best guess is JBC is shot ~Z-295. After Z-221, JBC is bolt upright. Not doubled over.
Caveat emptor, and draw your own conclusions.