Just my quarter of a penny:
I remember reading on a paid site specializing in strategic studies (intelligence community type of people running it) that the Oswald scoring hits
like the ones on Kennedy is "beyond credible". I also saw a TV program two or three years ago when they demonstrated the rate at which the
particular rifle was fired (using same model rifle and all), and I can tell you that's really stretching it. It's a bolt action rifle. Oswald must
have been a superman to reload and fire with surgical precision at this rate.
I think it's common sense to assume somebody else was invloved. That's just much better fitting the hard facts.