the fact that SUNACHIII from Kinemon and co is stronger than continuous G4 attacks... damn Oden's will is the key to everything Kaido-related. Literally Oda is going to utilize this. Kaido said his wound from Oden started to hurt again, and the scabbards used "Oden's Ryou". Like everything has to be "Oden" for shits to work on Kaido. Big Mom should've said sunacchi and proceeds to say Tougen Totsuka when she uses Ikoku and see if it's all about psychological damage that weaken his defense. If thats the case, Kaido's PTSD with Oden is no different than BM 's Mother Caramel
Thats how things are today memories are power ups like in fairy tail