@Herrera95 I am not writing Sanji in Manga. That is my observation about Manga. I share same view with you. Sanji has remain so passive since have entered new world.
We have seen lots of arc. Sanji's families fight has been impressive against BM and her crew. I do not want to disappoint anymore about Sanji. Throughout to all manga series until 1015 , Sanji vs Vergo not even fight . Sanji vs Dofilamingo not even fight. Sanj hit Big Moms ship not even fight. İn the WCI, just made cake. Until now in the wano, just did to capture Zoro and carry him. Have you ever seen any Sanjis haki enhancements Armanent or Observation ?
At the same time, we know that Zoro always took pivotal versus . Zoro vs Monet , Zoro vs Pica , Zoro vs Admiral Fujitora and at the Wano he hit Kaido .
That is the story. Zoro searching for good opponents for imporvements. Sanji searching those that need to help in the arc. This kind of things must have given clue.
Additionally, we have seen that how zoro's armanent haki enhance. When the cut Sanjis cigaratte, his eyes has been haki colour. I thought
Sanji observation haki is good until King hit Sanji even if Sanji is invesible. According to me , how ıs ıt possible. But oda prefered like that.
I love Sanji backround and fighting style. Also, as a visual , the most impressive matchup would be Sanji vs King. Clash of Flasmes with Haki. We have not witnessed this kind of versus.
To conclude, Marco should have come to take fight which is King. During the arc by arc, Oda can prefer to heal Zoro and put against King.
When looking Oda's preferences since new world, I do not think, Sanji will not fight 1 vs 1.
Marco vs King
Chopper and Yamato vs Queen
Jack vs Zou
We always remember Sanji from one of the most impressive moment in OP. (Against Enel)