The reasoning behind the documentary was a full metal jacket bullet would not have made such a mess with that last shot. I agree. Therefore the last shot came from a different gun.
I disagree about the FMJ. I have seen several wounds with FMJ where large arteries were hit (such as in the neck) and they can be very “wet”.
Did Oswald do it? I’ll look him up and ask when I get to my final destination.