I feel pretty confident that Zoro has unfinished business with Kaido. Oda just made the connection between Zoro and Oden stronger this chapter. The Ushimaru/Ryuma link also needs to be further expanded upon.
Whether or not Oda goes through with ZKK is up in the air. My heart says yes but Logically, it could take some shine away from Luffy so Oda will need to handle it deftly.