So basically what I'm seeing is that
Garp, Roger and Xebec were
the ones at the top it seems in the
flashback/God valley era, being equals basically
Then Xebec somehow got defeated, later on everyone also got stronger and WB grew so much that he became equals with Roger, but not just any Roger... But equal to prime Roger (Being called equal to the Pirate King)... Stated the
only man who was able to fight on par with Roger, the Pirate King
So it seems like Kaido and Big Mom wasn't able to grow as much WB did, with Kaido having basically praised both Roger and Wb being at the top
Hence his "list" also puts them both above Xebec... With Xebec still being stronger than Kaido based on Shanks... Who was able to clash and stop him, who also displayed a better feat with kid
Meaning currently no one has reached even Xebec's level
This still makes the most sense to me
Wanna see what's gonna happen with the
whole Imu stuff tho, that's something completely mysterious