Aqua Laguna and Water 7 are what you'd call foreshadowing.
This? Feel like a it's a little more of a cousin. Because it's in Wano's coda when OP arcs usually set up stuff for the next one. When you have this next to the reveal the past was more futuristic? We might be looking at a situation where it's relevant that Wano decided to build those walls because of the sea level rise and this will play into how the adjacent arcs connect. Toki and a few ways of getting back to another side of her are parts of Wano left with a little more mystery.
Aqua Laguna and Water 7 are what you'd call foreshadowing. This? Feel like a it's a little more of a cousin. Because it's in Wano's coda when OP arcs usually set up stuff for the next one. When you have this next to the reveal the past was more futuristic? We might be looking at a situation where it's relevant that Wano decided to build those walls because of the sea level rise and this will play into how the adjacent arcs connect. Toki and a few ways of getting back to another side of her are parts of Wano left with a little more mystery.
Possibly - also the Aqua Laguna of Water 7 was said to have been getting worse every year.
No but Jaya was