I was rather disappointed with this arc. "The Khitomer Conflict" didn't feel like TOS at all. Kirk has no agency in the story and the plot rather resolves itself rather than Kirk taking action to resolve it. The end is resolved by the intervention of Section 31. Kirk does nothing clever and reacts more than acts in the story. And the reveal of Sulu's sister wasn't really a twist. You could see it coming a parsec away.