AM--
Thanks for your inquiry.
Well, more or less Greer's narrative lines up with the Connallys, if I understand it correctly.
Mrs. Connally's narrative supports the "first shot hit JFK, the second hit JBC, and third hit JFK." The Connallys have been solid on that from Day One. They are not lefties, or KGB assets, and appear to have no axes to grind. They are just calling a spade a spade.
What Mrs. JBC meant by the word "recoil" is hard to say, but likely that was JBC doubling over from the shot that struck him, which happens ~Z-295.
BTW, JBC getting shot ~Z-295 lines up neatly with the many witnesses who described a "bang....bang-bang" cadence of shots on 11.22.