Sanji is a really weird character imo
Not in a wrong way, but he kind of feels improvised and kind of changed in terms of importance overtime
I think he has a chance of getting coc because of that weird tendency oda has to give sanji spotlight even when he shouldn't have it, although he didn't forshadow it
It's really hard to pair sanji with usopp at this point, I don't really think someone can read one piece post ts and say "hey, this sanji guy is as relevant as usopp while zoro and nami are way more important" and think he's not wrong
The main reason I say this is because oda's style changed over time
At first he clearly went for a typical shonen pattern, and he clearly wanted zoro as luffy's equal (and yeah I say this as a sanji fan) oda had to nerf zoro the early arcs to leave spotlight to luffy, and he had characters like arlong imply that zoro can defeat them, he even had zoro get compared directly to luffy by fodders who would always confuse him for the captain
And it kind of changed overtime, with zoro being paired more and more with sanji ever since water 7
Heck even the wings of the pirate king statement, the term used is "one of the two most important people to someone"
I don't think sanji should have coc, given how he had next to 0 forshadowing about it, but oda kind of likes to break patterns with sanji
He made him a character that has to be rescued despite him being the 3rd strongest, which is weird for a shonen
He made statements that contradict his early ones
Heck even panel time, sanji actually has more panel time, so much for a supposed side character
I guess this fight should tell, but imo sanji not getting coc isn't something surprising and him getting it shouldn't be surprising either
He's more like the Kakashi of one piece, a character that the author didn't intend to make that relevant at first