Sanji is going to fight vs Awakened Saint Saturn
First, all the strongest ones on Egghead Island can feel the appearance of Saturn except for Sanji.
You might think Oda left Sanji behind the game? No, but instead, Oda spends one separate panel for Sanji vs Saturn, he is the first Straw Hat who sees Saturn.
Second point: Oda has shown some of the awakening moments/power increase of Sanji in this chapter, but only sophisticated people can notice.
-He can easily see and hide Kizaru’s attack from a distance (future sight awakens):
-He refuses to fight Kaku and Vice Admirals to save his energy:
-He looks superior facing the power of science, why Oda let Luffy and Zoro appear at the same page?
-He ripped off S-Shark’s arm, why did Oda let intact S-Hawk and broken arm S-Shark sit next to each other?
Oda let Sanji change his eyebrows for nothing?
My guess is that Sanji might not defeat Saturn in this arc, but he is the game changer, the life safer at least.
*Theory by traxex123