Actually there is one theory that he was shot with an AR15. Supposedly one of the Secret Service agents in a car behind Kennedy accidently discharged his in the confusion and that was the head shot that killed Kennedy.
I read a book on it several years ago. It was written by a guy that actually took a rifle like Oswald’s and proved that he could of made the shots.
I can’t remember the author or the name of the book, but the SS guy he identified was pretty ticked off about it.
[Wiki] “Occam’s razor is not considered an irrefutable principle of logic or a scientific result; the preference for simplicity in the scientific method is based on the falsifiability criterion.”
Personally I think OR might be a rational approach to the JFKA conundrum.