I watched a video that posits Wuk Lamat was created later in development and retrofitted as Koana's replacement... and my god, it really is convincing
The seasickness, the intolerance to spicy food, the ignorance of her own culture and peoples, etc etc
These are traits that fit Koana REALLY well (having been in Sharlayan for so long) and they don't fit Wuk at all (who's supposed to have been in Tural her entire life alongside her father who is THE LITERAL DAWNSERVANT. HOW did her father not mentor her on the different cultures of Tural?)
She doesn't work because it wasn't her story to begin with. They basically put a character with a completely different personality in the same role at some point in DT's planning
This is the video I'm talking about btw:
https://www.youtube.com/watch?v=qjpxJV6_8Ic