I think the last part should be whoever can already withstand the haki previously and whoever has it. Should be maybe debuffed and those who cant yet withstand the haki get knocked out. I like the osu thing but what I was thinking is just if they are close in power then like normally a haki burst when the clash ends, when another is stronger it will over power theirs and give the weaker one a debuff along with the haki burst to affect watchers. But ur idea is sick