User blog comment:Kaido King of the Beasts/Cover Mini-Review: Solo Journey of Jinbe, Knight of the Sea/@comment-3075024-20150519212444/@comment-24.235.56.170-20150520133737

What about Gedatsu? And how does knowing what happened to Buggy affect the plot? Or Wapol? In the way that CP9 or Hatchan could just show up and say "Hey, by the way, I'm still alive", any of those characters could do the exact same thing with no impact to canon or anything the Straw Hats have done.

Even all of the "from the decks of the world"/"where they are now" ones are just nice little tidbits. They don't advance the plot, they just expand our knowledge of things going on with other characters.

That's how Oda does it. None of it really matters; it's just nice to know.