Why is it a mess though? Couldn't Firaxis just refuse it if they weren't happy with the result? And wouldn't Firaxis be able to explicitly request a native speaker if that were really a deal breaker for them?
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Speaking of outsourcing... could some of the models in the Leader Pass be entirely outsourced as well? Specifically Ramses, Theodora and Ludwig. They all look different from the other designs. Even Kublai Khan, which I'm not a fan off, still looks in line with the remaining Civ 6 characters.