Thats headcannon. Kaido is the wsc. The only thing its confirmed about shanks is that he can hurt him, nothing more. Also stop acting like the figures shown in chapter 1001 are on the same level. Roger destroyed oden in the flashback.
yes ... 6 years before Oden't prime ... when Oden couldn't even use Ad.CoC ... so no ... Roger can't do the same to prime Oden
not to mentioned Oden was fine after a NAMED ATTACK to begin with
Kaido lost in hype game to Shanks 2 times
btw
a weaker swordsman (Zoro) scared him for like
a far weaker CoC user (Luffy) fought him equally even without his DF
Shanks will FUCK him up
Kaido RUNNING LIKE DOG is the smartest shit he ever done