People surprised Hajrudin is this strong, when he went from working under Buggy, to Luffy.
The man achieves success through effort, not nepotism, what people CLAIM to want, and they still shit on him. Is Hajrudin Harald's son? Sure, but he's never been shown love/favoritism because of Ida, and Loki got the crazy genes.
Hajrudin IS proof One Piece characters that aren't the strongest when we first meet them, and don't have ridiculous genetics, can still get there through effort and Will. THAT'S GOOD, WE SHOULD BE HAPPY THAT'S HAPPENING.
That means, even if characters are royalty, they won't necessarily be strong. Look at Momo. Man is going to have to put in the work.
I do hope Hajrudin does get a Devil Fruit, though, ideally one for Harald's sword to eat (that thing is coming out of there, mark my words).
I actually hope we get Big Mom fighting next to Bonney Distortion Future Prime Jarul, too. Would be epic to see Linlin repay her debt with Jorul by protecting the country from Imu.