First panel, Nami is talking about Vegapunk developing a cure for the candy the kids were taking. We know from recent chapters that the kids have been getting treatment, but Zoro doesn't know that.
Considering Zoro's soft spot for Tashigi, the fact he stayed behind to protect the kids leaving the Biscuit Room in Punk Hazard, and how Tashigi wanted to protect the kids later on, it wouldn't surprise me if Zoro ensured the were safe. Zoro likes protecting kids, as seen with Rika in Shell Town and Toko in Wano.
Considering Zoro's soft spot for Tashigi, the fact he stayed behind to protect the kids leaving the Biscuit Room in Punk Hazard, and how Tashigi wanted to protect the kids later on, it wouldn't surprise me if Zoro ensured the were safe. Zoro likes protecting kids, as seen with Rika in Shell Town and Toko in Wano.
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