Pre Wano everyone would have been hyped if Zoro would have got King, a Katakuri-level fighter. I Still believe a fight between the two VC would have been a great match up.
But after Roof Piece anything less than Big Mom, CP 0-boss, Kaido or incoming marine admiral feels like a step backwards for Zoro. Just like Hawkins being a little underwhelming for Killer now.
Perhaps beat King and deliver finishing blow to Kaido could do it as well.