The whole "schtik" with Enma is that is sucks haki.
Sandai had to be "controlled" as well.
Which brings back to the point that he went to fight a yonko with a sword he still doesn't have total mastery over, then.
Dumb decision making.

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Unless, of course, the sword is INDEED a power up, and THE SWORD can allow him to cut Kaido, if he masters it, which seems to be the case.
Makes me lose a little bit of interest in his progression, but if Oda took things this way, it's just the way it goes. Not the end of the character for me or anything.