@haoxin
Because culturally, they don’t understand the idea of a guy being subservient to his wife and someone who could be king actively choose not to. To be fair, thats not too crazy. Male dominance is fairly common in older times due to the risk of giving birth for both the child and the mother. They are also all nobles and therefore, all have varying levels of ambition, so it blows there mind that someone who could easily be king won’t.
@wireath
IIRC, I think he used the seashells he was collecting earlier. Not sure if they’ll explain it later or this skipped past it. If you ever watched Dr. Stone, its the same idea.