there is a pattern in 4 previous Admirals introductions : they always met the Strawhats in their intros , or shortly after
• Aokiji - chapter 319 , met Strawhats there
• Kizaru - 507 , met Strawhats a few chapters after that
• Akainu - chapter 554 , spotted Luffy around 557-558 iirc
• Fujitora - 701 , met Strawhats in a restaurant
i think Ryokugyu will follow the same pattern and will appear in the end of Wano after Kaido's and Big Mom's defeats .
somewhere in 1020 - 1035 . so well within the next year
My theory was that he's named after the Apis Bull of Egyptian mythology, who has ties to multiple gods, some of which are depicted in art as green. Given kizaru is logia and ishoo is a paramecia, it'd make sense that he's a zoan to complete the trinity. Pre timeskip supernova are earth elementals (lava, ice, and light are all on earth). Post timeskip seem to have a theme of "towards the earth", light comes from the sun to the earth, gravity pushes towards the earth from pretty much space, and apis has ties to certain sun gods, so I think he'll be a mystical zoan with power over like solar waves or something like that.
HIm not eating is because he essentially survives on photosynthesis.
I mean a mystical zoan with that could work, but he's definitely a zoan.
Pre timeskip were logia earth elements.
Post timeskip are all different so far so he should be a zoan, with ishoo paramecia, and kizaru logia. Gravity and light go towards the earth, so that might be the theme, so I'm more of the belief his mystical zoan will give him power over like solar waves or something to keep him sustained like that and not the light itself, but like, sun energy. Which could tie him to the apis bull which has ties to some sun gods.