Sanji's shirt "Kill two birds with one stone" is probably about Shanks one shotting Kidd and Killer at the same time.
Or Sanji will 1v2 S-Shark and S-Hawk in the future Idk.
Egghead Sanji has showcase 3 of Sanji's best power attributes so far. Speed, attack power and durability.
Speed: Sanji saves Edison just right before laser hits him. So Sanji is faster than laser (as if it wasn't obvious enough during the Queen fight).
Attack power: Although it's only a Base/DJ attack, Sanji reproduces the same AP as G4 Luffy/Lucci and Zoro/Kaku combos. Which is a HUGE feat for Sanji.
Durability: It's safe to say that Sanji's durability is high tier or top tier level. S-Shark, a fishman karate expert that deals internal damage, was unable to leave a dent on Sanji, at best it was just some bruises. And the cigarette wasn't even budging. Sanji basically cross-arm diffing S-Shark in that moment.
As for the newest color page, Oda misspelled "Cooking" not once but twice. But why would Oda keep misspelling "Cooking" twice? Doesn't make sense.
So if the color page is a teaser of Sanji's Conqueror's Haki (or should I say, "COC"King),