Predicted: the cover-story B-plot revisits Syrup Village across later arcs; the three children grow up and pursue (and presumably attain) their stated ambitions. Ch. 40 is the planting chapter for a multi-decade cover-story arc.
Earliest known caller
Cover-story-payoff is a common-knowledge Oda technique; the specific three-ambitions promise is foregrounded by readers as a chekhov-explicit setup at first read.
Why this matters
The cover-story-as-multi-decade-payoff pattern is one of Oda’s most patient narrative devices: a side-character’s stated ambition in the margin of one arc becomes a literal cover-story epilogue several volumes later. Usopp Pirates / Syrup Village will recur in cover-stories across the series. Future-Claude should treat any named, sworn side-character ambition as a high-probability future cover-story payoff. The chapter-40 promise is the cleanest instance of the technique in early East Blue.
Cross-links
Usopp Pirates — the crew being disbanded as the seed is planted