In all honesty, this what One Piece series is all about. It is not selfishly focus on the main characters' development, or the main characters for the particular arc only. From chapter to chapter, even if it's just a little or massive one, Oda gives his best hints for the readers to notice themselves what are the significances of the current events and why they seem to not leaving much impacts on the story yet he still wants to show us such matters.
For us, we categorise characters as mains and fodders, but not in Oda's perspectives. The way he draws all the characters mean he likes each of them, hence the build up progresses. It's like how he introduces Arlong's crews and had one of them escaped from the Marines, that was Hachi, just to have that octopus merman became one of the catalysts to the incident of Sabaody, led to the separation of SH crews more than hundred chapters later.
~Hajrudin's feat is awesome in OP world, if you think twice.
~Orlumbus has an intriguing ability that can make people obey him, don't ya wanna know what it is? Ah... maybe not. But some of us do.
~Bellamy has haki. It proves his earlier words to Luffy that he's not the same as his old-self. Also, the scene where Luffy takes the hit, is questionable to many things.
~Zoro's final words, can be interpreted as either his badass line as always, or he's implying his confidence for his captain in defeating Doffy at the end of the arc.
~Some comedies for stressful readers... :heh: