S
You're right, Yamato has the feat of holding off Hybrid Kaido for a good amount of time with Kaido acknowledging her strength in the process. She has the most famous Haki in the verse, and also possesses a mythical DF that is the guardian spirit of Wano and probably awakened. In addition, she is an Oni with physical statistics above those of ordinary humans, and above all, she has very good techniques. Her Haki was praised by Green Bull as being very strong, and even in a state of exhaustion and fatigue after the war in Onigashima, she still manages to knock down Green Bull in his awakened form and make him groan in pain.
