Kaidou gets really annoyed, he wonders why they manage to damage him despite having power incomparable to Oden. Kaidou uses "Boro Breath" again, but Raizo uses a ninja scroll to absorb the breath, then he wraps itself around Kaidou and return the attack with "Makimaki no Jutsu".
A little flashback starts, we see the Red Scabbards training during the time after Oden returned from his adventure. Oden wanted to teach them his two-sword style but none of them accept it, saying they have their own fighting styles already.
Toki said Oden that they actually fought behind his back for the title of Oden's number 1 disciple. Oden tried to teach them about Ryūō too, but none of the Red Scabbards listen to him.
Back to the present. Kinemon, Denjiro, Inuarashi and Ashura pull out 2 swords and do the "Oden Nitoryuu" pose. Then they all attack Kaidou together using "Togen Totsuka", strking Kaidou at exactly the same spot Oden did in the past.
Kaidou's wound start to bleed and his eyes turn white...
So the Scabbard learn Ryou after his death, with make sense or they learning it during the 5year of Oden dancing around.
Overall awakened CoA is able to give them the power to hurt Kaido. And every Scabbard have awakened Ryou!!!