Last Chapter showed us how Sanji & King are Similar, Zoro & Ushimaru/Ryuma are Similar, and also Momo & Kaido/Oden
Only Luffy was left out
So my expectation is that the CoC Hint is about Luffy's CoC which reminds Kaido of Shanks
Cuz just like in Arabasta Fight, when Luffy used Water against Crocodile in Round 2 & still Lost
The Third Round was Luffy completely covered in Blood
Following this Logic, it makes sense that for Luffy to perform better now against Kaido, he will imbue his entire Body with CoC, not just Fists & Kicks, something that i'm sure Shanks can do