Whether the SS agent remained standing or sat down after the shot does not negate whether the fatal shot occurred. But the SS agent had to be standing for that shot to be made.
Look at the picture another posted on #63. That person standing with the gun in the car behind is identified as SS agent Hickey. I believe that is an AP photo copy. Seeing the agent in the foreground crawling on the back of the trunk of the POTUS limo makes it appear the Oswald and the SS Agent’s shots already occurred.
As far as witnesses, that is a legitimate question. But even with no witnesses or conflicting witness testimony, it would also be legitimate to ask whether the SS gun ever inspected to show a shot was or was never fired?
Donahue analyzed the ballistics and the trajectories. I have to tell you, it is quite a compelling analysis. The publisher had health skepticism. It did not have to publish the book and claims a history of not publishing wild-ass JFK conspiracy theory books. COnsider the publisher’s comment on page 247:
“Up until now, the report of the Herings of the House Select Committee has been the most detailed, careful, authoritative study available of the ballistics issues involved in the assassination of [JFK]. It is significant to us that Donahue’s technical analysis proved more trustworthy than the [Committee’s].”
You are free to “not buy it” the SS agent fired [accidentally] the fatal shot. My opinion is that you are shortchanging yourself by not reading about Donahue’s analysis who has considered more evidence, done calculations than all of us on this thread added together.
And he had no ax to grind or conspiracy theory to promote. He was dismissed by many others who the publisher came to realize ... others who dismissed him “on the basis of palpable nonfacts (p 252). [If] we cannot attest to [the certainty of Donahue’s analysis] it may be because of a natural reluctance to concede that such bad luck [by being accidentally killed by one’s own security detail], so unlikely and chaotic an accident, can prevail in this world. But to disbelieve solely because it was a long shot is its own species of irrationality.” (p 254)
I have read it and do not buy it. That picture is fond in the 6th Floor Museum and was taken at about 150 yards past the triple overpass nand not in Dealey Plaza.