After Squad stabbed WB, it was implied that WB's CoO has weakened.Uh, what? Whitebeard is a weaker overall fighter than in his prime because his reaction speed and his stamina decreased dramatically. There is zero evidence that other attributes, such as speed, strength, Haki(there might be an argument for this though), Quakes, etc. also decreased.
By Kaido's own hype, he's lost to Admirals and Emperors, people whose level Akainu has obviously been portrayed as being on. The top tiers of the One Piece world have never been portrayed as being far from each other/not on each other's levels.
Ofc by the manga, Kaido will win, but Akainu can still hang with him. The first part of this segment supports that.
We have no evidence to support this.