Who is Zoro's True Rival?

Mihawk said he would wait for zoro in his strongest form. He trained zoro to see him surpass him.

Mihawk probably want to have a relationship similar to how it was with him and shanks.

But killer is a vice captain , the same as zoro. Kid and luffy are rivals. So zoro and killer are rivals also.

Mod Edit: So what do you guys think about Zoro and his potential rivals? What about his true rivals?