First. Killer was nerfed and Zoro was full healthy.
Second. Zoro got Killer's scythe as his replacement for 3 three swords. We got that.
Third. Zoro one shotted Killer but he also get shotted as well. But the excuse of Zoro's fainting because of hunger or poison is absurd. lol
Hope that answer your questions gentlemen
Wait what nerf?
SMILE fruit neither effects Killers mental capacity as he still has SMILE fruit, Yasu had it as well nor does it effect him physically.
On top of it, he got better weapons from Orochi as no way in hell is nerfing his ultimate assassin.
While Zoro was missing his strongest weapon a weapon so strong according to Zoro attack from it was stronger than his other two swords combined. Also Zoro was missing his main fighting style, Zoro is a Santoryu swordsman and he himself claimed he prefers having all three of his swords.
Meaning off the bat Zoro was MASSIVELY I mean massively nerfed.
Then it was Killer who actually cheated, as someone else distracted Zoro while Killer took advantage. If you wanna call Zoro vs Killer 1v1 then by definition that is cheating.
As far as Zoro using killers weapon, that makes killer look even worse as Killer was too weak to overpower brutally injured Zoros muscle flex.
Beating an opponent with his own weapon is ultimate Chad move.
Zoro ultra low diffed killer there lol