If you are going to steadfastly rely on Gov Connally's recollections, you have to accept the entirety of what he said.
That isn't actually correct. Every judge will tell a jury that they may accept some, all or none of a witness' evidence but that they should look at the evidence not in isolation but in relation to all the other evidence.
The SBT relies on Connally being seated inboard of JFK's seated position in the back seat. How, if Connally is allegedly sitting "inboard" of JFK, can Connally turn to his (R) and, "...not see him"? The "...not see him" fits only if JFK is seated Directly Behind Gov. Connally.
I agree that the right-left trajectory through JFK's midline does not strike any where near JBC's right side, based on the positions of the two men seen in the zfilm at any time while on Elm St. JFK was slightly right of JBC but not enough for the path through his neck to go right of JBC's spine, and certainly not at z222-225. The argument, however, appears to be that the turn of JBC to see JFK is prior to z200. Although JBC wanted desperately to see JFK, it appears that he forgot that he needed to turn his head relative to his shoulders to do so.