Sorry fam been busy with work so haven't been able to propely react to this chapter (still am tbh), but funny seeing the usual suspects cope about it though lol
Anyways, Sanji's has always had kingly qualities (mofo is even bloody royalty to boot). I think it has always been a question of whether he decided to embrace it or not coz he very vehemently rejects his royal lineage so from that perspective I think this whole CoC ting is an interesting plotline as it'd be interesting to see what kind of Conqueror/King Oda makes Sanji to be.
It's also interesting that Oda puts Luffy in this equation coz Sanji has a tendency to restrict himself as a result of certain values he holds and is not simply driven by the desire to be strong for the sake of it so for him to get over that wall he's set up in his mind it needs to be for somone else and not necessarily himself. Kinda reminds me of the scene on Wano where Sanji had to chose whether to become an emptionless super soldier for Luffy. Oda seems to once again be presenting Sanji with another conflict to make him grow with Luffy as the catalyst basically asking him to embrace the concept of King he's always detested till now, but at the end of the day what kind of King you become is ultimately up to you so reckon that's prolly the direction Oda is gonna take this.