Coocoo.The question has long been "which Cubans"? Was it Cubans who were retaliating for an attempted assassination of Castro? Or Cubans seeking revenge for JFK's failure to send US military help during the Bay of Pigs invasion? How much of it was CIA, and how much if it was Mafia? Jack Ruby, the man who silenced Oswald, had a long record as an enforcer and bag man for the Texas/Louisiana Mafia, and ran a mob-protected strip club where Texas cops could get in free just by showing their badges. That's how he knew his way around Dallas police headquarters and why the Dallas PD did not question his presence there - they all knew him and thought of him as the kind of friend cops make in their duties.
In any event, it was unlikely Oswald, who was rated as Sharpshooter by the Marine Corps (midway between Marksman and Expert) could have pulled off the miracle shots with a WWI surplus rifle and mismatched scope. The most direct criticisms of the Warren Commission Report point out the improbability of that shooting feat, even without getting into the "magic bullet" reconstruction to account for all the wounds inflicted on JFK and Connally. I saw one documentary about the controversy where it was demonstrated that a shooter hidden in a storm drain not far from the assassination site would have had clear shots at the Presidential car. The "grassy knoll" story has not been proven or disproven, but it is as believable as the story that Oswald pulled it off all by himself.
Now what's that about Tower 7?
Oswald was a communist and a nutball.
He shot JFK.