An explicit problem-and-solution chekhov setup: the obstacle (mass cure impossible mid-battle) and its only key (the cultivator’s antibodies) are both stated on-page before the payoff.
Earliest known caller
(Not yet attributed.)
Why this matters
A chekhov-explicit seed of the cleanest kind: Oda has a character state the exact mechanism of the eventual solution at the moment the threat is introduced, so the later payoff (Chopper’s cure) reads as planted, not invented. The named obstacle (“practically impossible”) makes the eventual win feel earned. Cross-link Tony Tony Chopper, Queen, SMILE, Queen’s Virus Hobby Foreshadows His Bio-Weapon Arsenal.