Rivalery: You seem to not have read Wano arc as whole right? Udon, the scene on sea etc., the scene of BMs attack when they didnt dodge? Just because you dont want it to be, it doesnt change the fact these scenes are still there.
CoC, which you ignore right away, cause you know it lifts him above at instant.
Killer is slightly weaker then Zoro, i am sure about that, but he is kinda close to zoro by training himself in new world, without babysitting by any legend, without 2 years of training, which indicates for me, if he has gotten the same training zoro got, he could be at the same level at least.
His will is strong enough to go after Shanks, to go into BM Islands after that, steal whatever he wanted, went against Kaido, stands up and goes again against Kaido, the strongest creature in the world. And you call that will "shit"? That doesnt make sense at all.