For an analogy to work 2 things have to be similar, not be in the exact same group or category and differentiate from each other to work.
Here is the definition and my understanding of an Analogy:
Analogy Definition & Meaning | Dictionary.com
An analogy would be for example a human brain and a vast computer. They share similarities in calculating stuff but 1. the brain is biological and the computer is not. 2. The brain is capable of thinking and holding a conciousness and the computer is not. They are similar in one way or another but differenciate themselves completely. This however cannot be applied to odens and rogers attack explained above you.
By your logic of an analogy would be ''Oda meant Kamusari and not Togen Shirataki because they may be similar since they are slashing techniques but rogers attack had CoC in it therefore oda meant kamusari with it.'' How can you prove that Odens attack hasn't had CoC in it? Ashura had it, so why not odens as well? That would only make sense if only Rogers attack would have CoC in it. But we all saw that Zoros attack also had CoC in it without any lighting whatsoever. It would only be an analogy if Odens attack would not contain CoC to differenciate from Rogers one, but we all know CoC imbued attacks penetrate. Both Odens and Rogers attack did penetrate. And don't tell me zoros attack didn't penetrate, it did. Everything was too shallow, CoA and ACoA. Nothing could penetrate enough to deal lasting damage to kaido.