Vora does not counter Zhin for he has high damage plus sustain. He can time your obliterate w/billow&dash to counter it or cleanse bleed w/billow. To fight him: build stacks then fight. If not max stacks keep outside his basics
You can win against a khan for his high sustain plus damage. If spotted get behind and create a crossfire to make him show his back to your team or to die from your poke.