We really going to get pissy over it being 4 years coming up to the 5th year?
Alright
2nd of all ... my point is Oda clearly didn't had much of far looking ahead in details ... for fuck sake he add SN in one chapter out of air
Yes, the series has gotten away from him and he's not great at predicting things.
But it is absolutely not the case that when Oda still thought the series was only going to last five years at the time he called Luffy, Zoro and Nami the cores/triggers. He wasn't halfway through Alabasta thinking "you know, I reckon I can wrap this up in the next six months."
3rd of all ... by any logic he is not talking about story anyway ... unless Zoro fandom want to assume Name is more important for plot than than Teach or Dragon or Imu or rest of Yonko/Admirals
Uh, yeah, she is. For the most part, anyway.
The heart of the story is the Strawhats and their journey to achieve their dreams. The obstacles they face, the bonds they make on the way, all of that. That's what actually makes a story.
It's not just a set of flashy set pieces with strong characters. Nami was there long before every Yonko and Admiral bar Shanks, she'll be there after their defeats. She'a been involved from beginning to end in the story, she's not just popping in every so often in a moment of hype.
There's maybe an argument that the final villain- especially if it's Blackbeard, given how we've been seeing his rise parallel with the Strawhats- will prove to be the second most important character in the series, but other than that? Nah.