How the heck did JJ's Kelvin Klingons end up in the same Gre'thor as the prime timeline ones, don't they have a separate timeline/universe with their own version, also as a sidenote, why aren't there Mirror Klingons in Gre'thor if it lets in Klingons from other timelines/realities like the ones I commented on.
Honestly there could be just one Grethor for all timelines (assuming it's even a real thing to begin with) as for mirror Klingons there could be some honestly they look close enough to prime Klingons that we wouldn't be able to tell the difference unless someone pointed it out to us.
If Grethor is a real place it would be outside of regular spacetime, though it's just as possible that our adventures there is a collective hallucination and our image of Grethor is based on what our characters think it should be like (please do remember that by the time of the Klingon Civil War arc our characters have seen Kelvin timeline Klingons).
EDIT:It's best to accept this as just a mystery we're not likely to get an answer to anytime soon if ever.
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If Grethor is a real place it would be outside of regular spacetime, though it's just as possible that our adventures there is a collective hallucination and our image of Grethor is based on what our characters think it should be like (please do remember that by the time of the Klingon Civil War arc our characters have seen Kelvin timeline Klingons).
EDIT:It's best to accept this as just a mystery we're not likely to get an answer to anytime soon if ever.