To think of it, I wonder if sea stone is prevalent around Laugh Tale especially? Thats why Toki and Buggy got sick near it? Well I think they both got sick on the way to it, but isn it weird that 2 DF users just happened to get sick before going there? Might be coincidence ofc but I wonder...
We should have gotten more on Seastone at Wano than we did, considering it originates from there too? Only Hawkins had custom Seastone weapons too IIRC? Queen just had those cuffs and the only other Seastone based weapon I can think of is Smoker's Jitte? Wasted opportunity there by far?
We don't even know how the Kozuki enscribed Ponegylphs either?