But who cares what they do or don't contradict? What matters is that they're cool stories.
...which admittedly didn't stop my teenaged self from going through all sorts of mental contortions trying to make
it all fit. ("Right! Saavik's pon farr
-induced attack on the Enterprise blew open exactly the same parts of the hull
that Khan's did, and that's why Kirk's suddenly depressed about Spock's death again in STIII. Absolutely!")