Ok allow me to explain these points better
- Luffy
In Alabasta he already said "Vivi is naive because she doesn't want any casualties. People die."
2 years ago he understood that much.
But in WCI, in another dire situation, he suddenly pulled a Vivi. Then blurting another joke / nonsense in "even if you die, don't die!!". Wtf does that mean, and he wasn't even joking.
- Sanji
In pre TS, he already got portrayal of being the brain in the crew. Brain and brawn. Example is in that moment in panel, when he outsmarted Crocodile, beat his crocodiles, and in the end saved Vivi and the caged crew.
Then there's that moment when he was directly involved and knew perfectly how Luffy would do anything to save single nakama (Robin), going Ennies Lobby, telling Sogeking to burn WG flag thus declaring war, and faced Lucci who already defeated him once in Water 7.
Yet in post TS suddenly he lost all his brain and memory, acting like Princess and all. Genuinely believed how Luffy wouldn't came to WCI to bring his ass back to the crew, forgetting Luffy's effort to bring Robin back in Ennies Lobby.
Top tier character developments
- Luffy
In Alabasta he already said "Vivi is naive because she doesn't want any casualties. People die."
2 years ago he understood that much.
But in WCI, in another dire situation, he suddenly pulled a Vivi. Then blurting another joke / nonsense in "even if you die, don't die!!". Wtf does that mean, and he wasn't even joking.
- Sanji
In pre TS, he already got portrayal of being the brain in the crew. Brain and brawn. Example is in that moment in panel, when he outsmarted Crocodile, beat his crocodiles, and in the end saved Vivi and the caged crew.
Then there's that moment when he was directly involved and knew perfectly how Luffy would do anything to save single nakama (Robin), going Ennies Lobby, telling Sogeking to burn WG flag thus declaring war, and faced Lucci who already defeated him once in Water 7.
Yet in post TS suddenly he lost all his brain and memory, acting like Princess and all. Genuinely believed how Luffy wouldn't came to WCI to bring his ass back to the crew, forgetting Luffy's effort to bring Robin back in Ennies Lobby.
Top tier character developments
The 2nd point makes Sanji a weak character mentally, but maybe he would always react to his trauma that way and his weak point is baratie so we know that he did that to say his pops. The difference between WCI and EL is that Sanji was blackmailed using his family in baratie.