I still want to know the logistics of Gaban getting a giant pregnant
Okay, hear me out.
Ancient Giants, or Oni, used to be HUUUUUGE and had horns.
Who on the Straw Hats has horns, and has size-based Power Ups?
Good ole' Tony Tony Chopper, the Emergency Food Supply you can rely on.
Caesar was trying to make children into Giants by feeding them...
A drug shaped as round candy? That's the same shape as the Rumble Balls!
If Chopper can make a drug to make Giant Reindeer, why not Giant Humans? Would still be temporary, though.
This is why Caesar helped Chopper out with his Rumble Balls, IMO: Caesar wanted to steal and reverse engineer Chopper's Rumble Ball technology and reproduce it to gigantify people.
So, I think Chopper will find some medicine in Elbaph that allows for brief gigantification.
Scopper needs to eat Chopper's balls to bang Ripley is the moral of the story here.