If the shot the neck was from the front it exited out of his known back wound as that shot likely would have a downward trajectory. It would require an extreme angle upward (even more extreme than the least likely drainage ditch theory) for the neck entrance wound to exit through the back of skull where doctors claim there was a blow out. It is much more plausible that the fatal headshot came from the front right of JFK and exited through the back of the skull