But Christopher Pike is dead in the mirror universe and Kirk and Spock are obviously not friends although they have had a profittable history together. The Halkans seem to be exactly the same type of people on both sides of the mirror even if they look a little stressed! No agony booth or agonizers on our side either when our ship is travelling in the right direction!
JB
Sulu died in Mirror Mirror. Everything he accomplished after that would be different in the Mirror universe. Helping with the whales (yeah, like that would have happened), Captain of the Excelsior, fathering Demora Sulu and her accomplishments, etc...
There are a number of major character changes in the DS9 episodes, too.
Odo died in Crossover
Worf is not a Starfleet officer
Garak died in The Emperor's New Cloak
All of these major character changes would have profound influence on events in the Mirror Universe, making it vastly divergent from ours.
ETA As ZapBrannigan noted, Sulu did not die in the episode. The Tantalus Field eliminated his posse, but he was merely incapacitated by Kirk.
Even so, Pike was killed, presumably before WNMHGB, yet the crew complement was identical to the prime universe. So a "premature" death of a key character need not have such profound effect in the Mirror Universe.
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