So if Akainu is stronger than Prime Garp, who is said to be equal to Roger, that means Kaido surpasses Roger, Akainu, and Prime Garp, which is not surprising at all, since King was saying those beautiful words to us in his flashback.
And obviously, Oda confirmed:
Q: Is my mom stronger than Akainu?
Oda: She is even stronger than Kaido.
However, I don't think that source is reliable to begin with.
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Oh, that's unfortunate. So, is this information not even on the Wiki? Was it a member who posted it in the comments or something? That's really sad.