Very interesting question.
Thanks for bringing it up here in the forums rather than just in Discord.
I can see there are a lot of theories behind the various viewpoints.
I do hope we get a definitive statement from the Devs on it.
Especially prior to settlement placement.
My own opinions are as follows:
1) I do believe the "racial" restrictions are there for a reason. It's my thinking it has to do with keeping the unique and individual nature of each tribe through launch. As someone already mentioned above, there can be ways that King Wenceslas can lead the Tribe of Mud People even though he is actually descended from space aliens, but I don't think that is what they want coming out of the blocks. It would dilute each tribes particular lore and their individual diversities before they had a chance to develop. It will eventually happen over the course of the ten years. And I think they do want us to do it. I just don't think that is where they want the game to start.
2) I do think the definitions of majority and minority do need to be addressed. Especially in the transitional biome areas. What constitutes the majority? And how is that calculated. Is it the greatest population in the Kingdom? The Duchy within the Kingdom? Each individual county? And if those differ from county to county, as I'm sure they will, which takes precedence? Restating it using your example above, I would say that the King of Kingdom One should probably be either Brudvir or Hrothi. And of Kingdom Two either Hrothi or Neran. He certainly shouldn't be Janoan. But does that mean if you are King of both, that you have to be Hrothi, because it is more dominant in both? Or is it based on the majority of the population in the physical location of the capital? If the capital is located in the Neran section of Kingdom Two, can you then be a Neran as that is the local majority vs. the total Kingdom majority? That is what needs to be clarified in regards to the term majority in my opinion.
3) My last point is one that I know that all the Kings I have come in contact with have been most attentive to following. That the good of the overall game is more important than any individual. No matter their position, or the amount of coin they have spent, or when they spent it, the Nobles first role at this time is to lead and develop the rest of the game for the future players. It is a role of great responsibility and some self-sacrifice. And not cut out for everybody. So far we have seen quality leadership in these positions as we all work collaboratively in putting the foundation together of what will hopefully be a long and very wonderful world. This focus on the big picture needs to stay true as we go forward.
Well...That was a lot more words than I thought it would be...LOL