Kin’emon’s fire style doesn’t end at cutting fire. kin’emon can also set his sword on fire and throw fire cuts as projectiles
Zoro could Cut people and set people on fire. You don’t think that is somehow related to Kin’emon’s style?
Also you don’t think it’s suspicious that Zoro was NOT there when Kaido blasted the strawhats at the very start of Wano?
Zoro could Cut people and set people on fire. You don’t think that is somehow related to Kin’emon’s style?
Also you don’t think it’s suspicious that Zoro was NOT there when Kaido blasted the strawhats at the very start of Wano?
And Zoro didn't used fire with him.
So he didn't knew how to cut Fire back then.