Hallo,
please show mercy for my first time...
There is a little bit like panic - Mr Sanderson is as relentless as Mr Martin, but mostly MCs die in his books after they has fulfilled a purpose - mainly spred knowledge, skills and something like that.
They die, when it is possible to die without letting the plot came to an end.
Like with Jasnah and Shallan - Jasnah's purpose was to give Shallan the skills, the education and methodes to get her own arc within WoR - even if Shallan has to persued her for the wrong reason.
Like Kaladin and the bridgemen - he can't save everyone, but he can train them, can give them the abilities to survive - the chance to live and teach other people.
Dalinar - he's the "Mentor" and my first reason to be afraid if someone has to die.
But not without making a point, he IS a Bondsmith now, perhaps it will be for a spezial bond.
Kaladin - same here.
After saving the king he has a new goal - Elhokar wants - drunk, but "in vino veritas" - Kaladin to teach him how to be a leader.
And Kaladin has recognized him as someone like Tien - Elhokar tries, but haven't had a real teacher.
Looking forward I think it logical not to accept how stupid Elhokar is, but to teach him to be a good king.
Moash - we leave him in WoK also whining - please, do something!
If he really wants to redeem himself - don't let them have a Shardplate/blade - you are a Shardbearer - fight, don't let them get this.
Think of Kaladin and the lesson he has taught you in the last fight - if you are on a wrong path, try to make it right - or die trying.
And his purpose in WoK was to bring Kaladin with his action to the next level of his oath.
Adolin - killing Sadeas isn't essential for any romance-plot - Shallan will have a word in this and that's it. She will be with Adolin - even if he will be punished, if she loves him - or with Kaladin, if not.
On the other hand was Sadeas a walking dead since Adolin got the right for a duell - Adolin fighting with Sadeas was only a matter of time.
Personally I think this is the start of his own arc - now he has the original Shardblade of his father back.
In the end he's reacted like a coward, but there is a dead Highprince and there will be investigations and - wrong - accusations and a chance for him to show his qualities.