This is in the category of things i didn't know, and wasn't interested in. They cannot have left those missiles and bombers in Cuba, however, under Cuban control--we'd have known about that sooner or later, and probably sooner rather than later. Overflights by U2 aircraft, or, later, Blackbird aircraft would have seen them. That was how we learned about missiles in the Cuba in the first place. What was significant was that it was, overall, a defeat for the Soviet Union. Khrushchev did not last much longer, and i suspect that this event was one of the contributing factors in his fall from grace.
I seriously doubt that the Cubans were capable, on their own, of operating their own weapons systems of those types. The negotiations for removing Soviet personnel from Cuba must surely have included removing the weapons systems. The bit about Ché Guevara suggesting tthat Cuba keep such weapons systems as a threat is an ugly joke. Had the launched any form of attack, Cuba would have been quickly been turned into a large, radioactive parking lot, whatever else may have happened.