I'll be honest with y'all, Vettori is definitely a very solid fighter, but not particularly a spectacular one.
It's a bad matchup on paper for KH, but there is something I see in him that leads me to believe that he can pull this off. I think the Brunson fight might be a poor measure of what he can actually bring to the table. He played up his "big mouth" character too much and did not perform to his standard. A bad day at the office; nothing more, nothing less.
I think if he can keep the fight at striking distance, he wins. If I were a betting man, I would pick him to win. I think he can be the first person to finish Vettori.