Base Kaido is undoubtedly inferior to base BM who matched his hybrid strength with Hakai.
Kaido literally said he would kill her multiple times and shat himself at the sight of her ship.
BM also says it has been decades since she was hurt unless you wanna say Kaido’s AP is trash. It’s simply hype for the final battles in Wano.
What does that make Admirals like GB then who alone was deterred by Kaido’s presence and shat himself at another Yonko’s Haki a thousand miles away which Luffy called nostalgic?