Why would Kaido scar himself you dumbass?
Scar = is because of CoC, not because of power, Zoro was an annoyance at most.
Oden made him seeing death.
That's why after 20 years he still remembers him and still that high esteem of him.
But he won't remember an "annoyance".
It's like you don't remember the annoying flies which bothered you some time ago, right?