The deciding factor will be the progression and outcome of this queen v. sanji fight.
A lot of the zoro fans don't believe it will be 1 v. 1 or if it will end in sanji's favor.
If that's the case, they won't consider sanji as a major fighter.
You think that it will end up being 1 v. 1 with sanji winning makes you think that he is a major fighter, which is also very valid.
Ultimately, one group values past performances more than future performances (regardless of how certain the future might be).