Stop with the head cannon. You still have yet to even explain how kaido sensed something other than odens haki coming from enma.
We have nothing else to discuss until you answer the question you been dodging
Like i told you before he sensed his will and he sensed Zoros haki which is similar to oden. Dead men dont posses haki, everything other than this is literally headcanon( which is ironic because you are claiming others are headcanoning because they believe this)
If you believe otherwise then prove it. Give us 1 panel or 1 line or anything in the manga that proves that dead people can emit haki, or that their possessions can contain haki.
If your answer is enma then you are headcanoning because Enma is a sword like every other sword and it doesnt contain a dead mans haki. If what you are saying then other item in the series should contain haki. But they dont, because dead men dont emit haki.
Haki dont get passed but peoples will does, The will of men get passed from items and words and actions that you can find plenty of proof in one piece to back up.