Oda just has a fetish for physically weak but good hearted leaders of nation so he can make them obsess over Luffy. He did the same with Momo and carrot.
Hajruddin is a fully grown ass adult, it's shameful that he is neg diff material for out of TS G2 Luffy.
Carrot is a nobody who was handed over leadership, cause Oda had to give her something in compensation for not having her be a crewmate. Even though musketeers are stronger and more experienced in leadership.