Zoro : Wait! Wait ! Don't eat ...
Zoro : My captain!!
Zoro : Santoryu!
Kaido : hm ??
Kaido : This form of haki!!
Zoro : Kujou Ô Tatsumaki!!
Kaido : Uoooo!
Killer : (sorry the picture is cut)
Big Mom : That kid .. He managed to cut Kaido
Kaido : Oh .. i see it's working! That's Oden katana ?
Kaido : To think you challenged me with Tatsumaki, Uerororo"
We talk with @ivaannom so before claiming lots of things, we agree that 正体 means form or identity.
So Kaido is seeing here that Zoro is using the same form of haki of Oden "Ryou", exactly like when the scabbards used Ryou on him. For Kaido who doesn't know anything about Ryou, he refers Ryou to Oden's haki. That's when Scabbard and Zoro used on him, he calls/sees that at Oden's haki. Also why he didn't understand how Luffy hurt him with Red Roc at first.
No there is no haki of Oden here.
NO THERE IS NO HAKI OF ODEN HERE.
Get it right downplayers, no such thing as Oden's haki but the quality of Zoro's haki.
Big mom was surprised that Zoro cut Kaido and everything. She didn't mention anything about Kidd, Killer or Law's attacks though.
And right after Zoro countered Kaido's tatsumaki with one of his own Kaido went "oh so you did that to my attack? Let's see what you can do against this one then" and did a mixture of his Destructive Wind with his Tatsumaki just to see what Zoro can do against it but he had to carry Luffy so he couldn't do anything besides dodging.
Then Kaido went hybrid form and he did so not after Luffy's Kong Gattling but after Zoro's Kujou Otatsumaki.
Us Woro fans just can't stop getting Ws after Ws on a weekly basis even on the sbs lol