What I got from this Oda said Ussop will b the weakest thing was actually that Ussop will always b one who can b comparable to a normal human so when compared to the likes of Luffy, Zoro or anyone with above normal physical stats yes he wld b the weakest in the SH. Nami however is quite comparable to a normal human just like Ussop so their strenght difference is not the punchline to that statement.
Not forgetting that in the shonen sense when someone mentions fight the picture 'we' get is probably two guys fighting so IMO the conversation btwn Tanaka n Oda was more in the compare Ussop to the other guys in the crew n at that time it was only 5 SH, and to add Nami wasn't the fighter she later became so she wasnt part of the pple Ussop was being compared to in this very general conversation.
Im too lazy to confirm when this conversation was had but if it was after alabasta the forget my last point.
Not forgetting that in the shonen sense when someone mentions fight the picture 'we' get is probably two guys fighting so IMO the conversation btwn Tanaka n Oda was more in the compare Ussop to the other guys in the crew n at that time it was only 5 SH, and to add Nami wasn't the fighter she later became so she wasnt part of the pple Ussop was being compared to in this very general conversation.
Im too lazy to confirm when this conversation was had but if it was after alabasta the forget my last point.