According to this analysis, DPD Chaney is unaware JFK or JBC were ever struck by the first bullet. Despite the fact DPD Chaney is seen staring at them in the Altgen's photo.
In Altgens’ photo we see Chaney’s head in profile. This necessarily means that his head is pointed about 90-degrees from the camera. Here’s a crop of the photo:

Now let’s take a look at the relative positions of Chaney and JFK/JBC. Here is a crop of an image by Dale Myers that shows an overhead view of their positions at the time of the Altgens photo:

I drew the yellow and blue lines to indicate directions to the other two motorcycles on the left side of the limo (yellow line) and to JFK/JBC (blue line). Altgens’ position can be seen near the lower left corner of the image. I submit that if Chaney was “staring at JFK/JBC we would not be seeing his head in profile; instead Chaney would be looking more towards the camera. Therefore, it appears to me that Chaney was looking at what he told the FBI he was looking at just after the second shot.
There are a number of problems with this picture and explanation. You have mixed up the fifth (1975 FBI) statement with the previous four statements given in the aftermath of the assassination with two completely different explanations of the shooting.
This is nothing more than what do you believe.
Charles Collins:
“That is not what Chaney said. He said JFK appeared to be looking over his left shoulder. The only place we see anything of that nature is in the clip provided in the first post in this thread. It is from about the mid Z40s to mid Z150s.”
“I cannot believe that Chaney would describe JFK as looking over his left shoulder after he was shot around Z224. It should be obvious to anyone who sees the Zapruder film that at that point JFK was reacting to being shot. Chaney wouldn’t have left that part out.”
Neither of your two versions ever mentions the throat shot. Just the headshot. For the 1975 FBI version he just added an extra shot with no explanation.
Version one explanation has an early missed shot at Z145 followed by the headshot
Version two explanation has DPD Chaney looking at DPD Hargis at Z256 instead of the wounded JFK and JBC. No mention of either JFK or JBC having been wounded which you have stated:
“Chaney would not have left that part out”. But he did. Now just do the math. If the second shot or bullet is the headshot, what is the first shot or bullet?
Neither version ever mentions the throat shot. Just the headshot. Version two has an extra shot added with no explanation at all.
This new version now has DPD Chaney looking at DPD Hargis, at least in this new version based on Altgen’s photo at Z255. At this point JBC and JFK have reacted severely to having been wounded.
The first shot and JFK and DPD Chaney heads turning left at Z145 has now been moved up to Z255 and after JFK and JBC have both been wounded which is what DPD Chaney is looking at.