Lmao theres a reason Oda took Sanji outta the plot. Hes saving him to use later. Hes done this like multiple times.
Alabasta: Sanji disappeared, whilst the crew got focus. Then Oda later uses Sanji as a trump card to save the crew with his cool Mr Prince moment.
Skypeia: Everyone fights Enel, whilst Sanji is unconcious. Then Oda later uses Sanji to save Nami, and give him his cool "I needed a light scene"
Water 7: Everyone is running around the island. Then Oda later uses Sanji to have his cool moments on the Sea Train and save Franky and Usopp.
Ennies Lobby: Everyone is fighting whilst Sanji is unconcious. Then Oda later uses Sanji for his cool "Im the Hunter" moment.
By now you should already expect that something good is coming Sanji's way. Sanji hasnt been sidelined like this since Pre-timeskip, so hes going back to his roots as a character. Usually his moments are in the forecenter of the main plotline within the chapters. Sanji has a high potential to get on the roof or perhaps do something else of use. Either way laugh all the while you can.