Not sure what difference that makes.
Of course you don't.
Jackie had the best view of the head wound: top, behind the forehead.
Now show us images (photographs and/or film) of even one of these Parkland doctors (who claim a rear exit) actually looking closely enough at Kennedy's head to make an accurate, valid determination.
After all, you
did claim ALL witnesses are unreliable. However, I would say that witness testimony backed up by film and photographic evidence would go a long way in persuading a jury that the witness is reasonably accurate.
The Zfilm backs up Jackie's closeup view. She kept looking at JFK's head throughout the impact & the brain-matter exita sequence it seems to me.