So many Zoro plots went nowhere:
* Zoro rounding up the Samurai
* Kaido detecting Oden's presence in Enma
* Kaido declaring that we'll never see a Monster Samurai of the likes of Kozuki Oden again
* Zoro's comparisons with Ryuma
* "The Second Coming of Ryuma"
* Zoro visiting Ryuma's grave
* The Grim Reaper
Likewise if he tag teams Borsalino.