obviously it's just a typo and not the intention of the rules, but regardless of that you couldn't exploit the typo in this case because it has to interact with one of the other characters that doesn't have it, you don't get to say "I'm applying kor'sarro khans wording" because you still meet the requirements for the other one, which is more than one special character with the chapter tactics rule.
You have to apply chapter tactics in a way that mutually satisfies both special characters, and this cannot be done if you try and apply two bonuses, not to mention kor'sarro khan's chapter tactics makes all units trade Combat Tactics which would mean you no longer have Combat Tactics and can no longer trade it in to make use of another special rule.
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