Most of the filler scenes are successes of what is official, things are simply added that due to time in the manga are eliminated
Why is it always a coincidence how most of the filler scenes favor Zoro and detract from Sanji? Because it is simply the reality of each character's level and when the filler scenes show that, the pervert fans get angry xD
You will say that they are invented by Toei and that Oda has nothing to do with it. But why did they add a Zoro scene with clear hints of the king's haki in sabaody if Oda hadn't mentioned anything to the team?
And yes we have many more things and details. The filler saga where Luffy and Zoro fight, with Zoro winning (what kind of animation team would do something like that? winning a character from the main protagonist?) Do you think Oda would have allowed it if it were crazy? No, but how for people who have brain, it is logical to think that Zoro >= Luffy and more so with the details that Oda gives, well, that's how it was.