Wuk Lamat doesn't need to die, she just needs less screen time, and to be humbled.

Killing Wuk Lamat actually highlights an even worse problem - The Scion's plot armor. Everyone dies around them and they never die even when they should have (looking at you Ysh). There's only so many times they can pull that and we're nearing the limit.

Now, if you have Wuk Lamat try to befriend a foreign entity only to have it take advantage of her good nature then horribly betray her by killing people she's close to (like Koana), then you'd get a massive chance to have her mature fully into the role of a leader.

Why Koana? No one else is really built up to be as meaningful to her as him. If it were someone else they'd need to build that person up first which is fine, but don't kill random guard B or newly introduced cousin C then expect me or for that matter Wuk Lamat to really care.

How does this avoid Scion plot armor? Simple, you don't have the WoL or the Scions present. You have a fight, Koana is bleeding out before Wuk Lamat's eyes, and you play as Wuk Lamat to save him. She isn't fast enough, he passes away, she's left with regret, guilt, and the "what if" scenarios because there was a chance to save him. She's also filled with anger, like pure rage (we've done despair in EW), and it is up to the WoL to help guide her through that rage using their experience with Nidhogg to help.

Hell! You could bring Wuk Lamat to Ishgard, walk her through Nidhogg's story, the story of what you get from pure rage, have her speak with Hraesvelgr and Haurchefant's brother who can speak to how his brother's death devastated his father, and finally you can introduce her to our boy Aymeric, a man who had to put aside his own rage / bias for a friend in prefer to bring people together and rule.

This would actually be really good.... Please do this.