The weapon-sacrifice is the chapter’s Pirate Pride thesis made literal. The Elbaf
honor-doctrine — established as die gloriously for honor (Ch. 117) and name-is-self
(Ch. 119) — pivots here into spend your most treasured things on the people who saved you.
The warriors who could not set aside their names or their wounds for survival willingly
spend their century-old partner-weapons for the humans’ sake. Pre-loads the recurring
veteran-warrior-passes-on-or-spends-his-weapon register and the Strawhats’
debts-to-mentors grammar.