I know your feelings are hurt but that's just the truth.
Someone as weak as Oden who got one shot by Hakiless nameless club swing no sold the same attack from MUCH MUCH MUCH MUCH MUCH stronger Haki user.
It would be wrong to suggest that slash can even wake Zoro up from his nap.
Zoro probably deals with that attack like this
I don't get the point of a random ass side character to 2nd most important character in the series. Zoro's bandana literally has 100 times more panel time than Shanks.