Duo physical power, he need stronger attacks. He hit Kaido in the moment when Kaido was himself using Boro breath.
Also Kaido has FS, didn't you read the summary?
Also Kaido has FS, didn't you read the summary?
You don't switch to a less fast mode if your opponent is being too fast which implicates they are dodging your attacks too well.
I understand about power instead which is a different matter.