All i see is someone beimg scared to put their mouth where their money is. Sanji already implied he could upgrade his flames by training his armanent haki, his body was weak to withstand it. You my friend makes no sense. Imagine oda writing zoro dealing with immortals using coc whiles sanji is finding ways to deal with them. You guys switch your damn brain cells off when it comes to sanji. He is the left hand of the pirate king . Even before we got this chapter , i already said this . Scopper gaban damages a HK with acoc, gets defeated and is thrown down to the guys below cos there are 4 people who has coc down there, luffy , zoro, sanji and Loki. He teaches them how to overcome the HK and then they fight them. Zoro has to figure out he has being using acoc all the time. Sanji needs to allow his body to awaken it and since he is imtelligent, he would be able to coat his flames making it black. That is why oda hss being spamming ifrit jambe cos surtur jambe is coming up.
I already have a bet too and i am still willing to take this one.