Luffy is the next pirate king. He inherited the will of Roger as well as the original Joyboy.
Koby is the marine hero. He inherited the will of Garp, who was also a marine hero.
However, if Joyboy was the first pirate, there must have been a marine hero in the past who opposed him. Chances are, this marine hero was Sora, the warrior of the sea
Being as Luffy as the same Nika powers Joyboy had, imo it only makes sense for Koby to have Sora’s raid suit and weapons.
I think it’s possible that Sora’s suit is somewhere in Elbaf or Lodestar. I think in the next upcoming arcs, Koby will find and awaken this suit, becoming the next Sora. Just as how G5 made Luffy the next Nika/Joyboy.
Currently Koby seems to have pretty strong CoA and CoO. I’m not sure how advanced it is, but it is undeniably strong. Were Koby to get ACoC and then this suit as well, he’d basically be admiral level.
Im guessing that’s how Oda will make Koby an admiral.
Referencing the other characters in the comic, imo:
Grus = transforming robot.
The ancient robot of the void century was named Emeth. His name is derived from Emet. In Jewish folklore, rabbis were able to give life to a golem by writing the word “Emet” on it.
Having a the clay fruit, I think Grus could create golems stronger than Emeth.
Helmeppo could be the Seagull. Perhaps he will get the tori tori no mi model: Seagull. Tbh he really needs something like that because he looked quite ass in Hachinosu. He should be at least above the egghead VAs by EoS. A fruit like that could do it.