@Salah WG what do you think of the progression I mentioned, is KOH Onigiri Zoros new base from here on out. Can't wait to see KOH 10800 Pound Canon or KOH Sanzen Daisen Sikai.
Zoro can apply Gentle Blade or Strong Blade on his Techniques, similar to how Luffy can apply Gear 2 (Speed) or Gear 3 (Size/Weight) on them,
As well as apply CoA or CoC,
King of Hell Mode is basically Zoro's Gear 4, where He can make his Max Output accessible & ready to use,
People confuse the two, because Luffy's Martial Arts uses his Body, so his Upgrades would be visible on his Body, hence such Transformations,
But Zoro's Upgrades are only applied on his Sword Handling, but the concept is same & one,
(Even for other SHs, Usopp's Gear 2 is when He added Dials to his Weapon, and his Gear 3 is when He added Grow-Up Pop Green to it ... etc)
Which Level does Zoro decides to start with against his Opponents will depend on how Strong He feels They are, (Which could happen immediately or after sparing with them first), you shouldn't look at which Mode He uses, cuz that simply decides his Stats, He went to King of Hell Mode directly cuz He sensed Imu's Haki & He didn't want to risk not giving Imu a Serious Injury like when his Attack wasn't enough against Kaidou due to not feeding it enough Haki,
This is second time, Zoro's Upgraded Finishers were Blocked & Cancelled out (First was against Nusjuro),
So Zoro will probably decide to start unleashing more of those Techniques, regardless if King of Hell or not,
Just to have an idea, Zoro have demonstrated so far +25 Techniques, but We only saw Upgraded Forms of 8 of them,
So it's not King of Hell Pound Ho you should be looking for, but instead it's Evolved Form (Similar to how Sanzen Sekai turns into Ichidai Sanzen Daisen Sekai),
Since Imu is Devil and his Name also References Buddha, then Zoro might try these Techniques on him:
Upgraded Enbima Yonezu (Literally means Charming Demon Sleepless Night with Imu-Like shadow appearing behind him)
Upgraded Daibutsu Giri (Which is like Gatling Oni Giri, meant for Buddha)
Upgraded Pound Ho (Due to Scale of Elbaph)