when did low diffing the same character mean you are relative. it is like saying sanji and zoro are similar in strength cause they both low diffed the same fooder
Are you calling Lucci fodder? And this is not a one off instance where Zoro and Luffy have faced the same opponent in the same arc and at the same power level.
Zoro fought Hody, Luffy fought roided Hody
Luffy foguht Hyozo, Zoro fought roided Hyozo
Zoro and Luffy had run in with Monet
Zoro and Luffy fought Fuji
Zoro and Luffy fought BM and Kaido
Out of the above, Zoro and Luffy vs Kaido and Lucci is them fighting the same opponent in the same arc at the same power level. Tell me where do the two do not have same/relative performance against their opponents.
RT made Zoro and Luffy look equal before Luffy got ACoC.
Zoro and Luffy low diffed Lucci in Egghead.
There are not many characters who you can say can low diff Lucci. Before Zoro's fight vs Lucci I doubt anyone would say that anyone besides established top tiers can low diff Lucci. Only Yonkos and Admirals could be said to be able to low diff commander level characters like Lucci and Lucci is YC1-2 range character.