Three shooters including Oswald (who was basically a designated fall-guy/patsy), the other two equipped with then state-of-art collapsible sniper rifles with real scopes.
About 15 years ago, after looking at all the conspiracy theories, the backgrounds of the individuals within each one, and how the whole thing played out over the following years, I came away with the assumption that the most plausible explanation is that it was LBJ.
But by then it was distant history.