Lots of manga reading people (more so one piece) really don't got much comprehension at times. Some do but overall its very diluted. Same with people who read hunterxhunter. Hence the whole dumb narrative about marines doing good.

As for oda or broader one piece ending I don't think he is really putting forth some communist treatise. Mainly cause I don't think he himself got any grasp on how contradictions resolve. It would be some vague "oh the masses chose whatever form of governance and live happily ever after".

I love a song of ice and fire, grrm is a old hippie guy. Even then the text stands on its own. He really gets good with ruling rich mfs and their attempts at keeping their wealth at an enormous cost.

With garp or koby they are kept forth as foils to other characters. Garp is much of a foil to his own son just as Harald is to rocks. Garp is someone who thinks military has a public utility but he still dislikes what its real use is for. So he tries to distance himself by being underneath chain of command.

Garp or his actions are not known until we get there I guess. Him being a indecisive stooge is his theme. Whether aokiji is a spy or not is unrelated but his fight with garp was on the same grounds.

Koby is the same he is kept as an foil for luffy but koby himself overestimates his capability.

The ending will be something as I said "everyone gets together and runs their nations, live happily ever after". It doesn't really matter to me. It could be whatever. But that's that.

That's why I love araki and his Jojo series. He loves his anti climax so much.

Fans suck don't think about what they push forth.