The narrator said they grew stronger until a causing a specified future incident. Meaning when a specified future incident occurs, the Fleet Captains will be stronger than they were at Dressrosa. Absolutely nothing about the narrator statement implies Hajrudin grew stronger between Dressrosa and Elbaph. It’s only saying that he will have grown stronger by the time of the final war.
How do you know the growth here doesn't refer to fame? They could grow in fame in their own way. Hajrudin by fighting alongside Luffy and Loki. Buggy by becoming a yonko and so on.
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