The strongest Marine in history, aka someone stronger than Prime Garp went 10 days with his fellow Admiral Aokiji and fight was categorically stated to have gone either way
And Kizaru was clearly portrayed as 2nd strongest, though gap being less than microscopic between the three in Marine Ford where
Akainu majorly faced Whitebeard
Kizaru was dealing with Marco
Aokiji dealt with Jozu
But then you could say all three faced Whitebeard, yes but Aokiji looked the "worst" among the three or I mean least impressive but Kizaru looked the most impressive treating Whitebeard, literally like a toddler. Its like me boxing with my 12 year old cousin,, just not fair you know..
All and all if Akainu and Aokiji are this close then can you imagine how close Kizaru and Akainu will be?
Just think about that.
And Akainu is categorically stated to be strongest Marine in History, meaning above Prime Kong, Above Prime Garp who is confirmed Pirate King level character and above Prime Sengoku.
So
worst case scenario for all three Admirals is that they are Pirate King level
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