It is. Its the 1st attack used. And the fight is over
Clashes mean nothing.
Hyozuou did the same.
How can it be a oneshot if he’s been hit beforehand?
Shanks vs Kidd is the clearest example of a oneshot in OP
An extended fight where Lucci has taken damage with Zoro landing his final attack is not a oneshot
Otherwise almost every fight in One Piece has ended in a oneshot
Assuming the spoilers are true, IMO the truth is somewhere in the middle of what you both are saying.
Yeah, Lucci had some scratches here and there, but it was just Oda stalling for the plot.
The minor injuries were from these clashes.
There is no reason Hyozo, Apoo etc should've lasted long against Zoro either, but they did until Oda wanted plot to progress where he wanted it to be.
But one named attack and Lucci is out. Things will get cleared up when raws drop, but what likely happened is that most of the damage Lucci took probably came from the one named attack that landed.
In which case it isn't a one shot, but quite close to it. Lucci probably went from like 70% to 0 with that hit. Different from Luffy vs Kaido, Kata, Doffy etc. Where the damage was truly accumulating over time.
If spoilers are true, this is a low-mid diff for Zoro. Straight up low diff if no advanced Conqueror's.