User blog comment:LuffyPirateKing/Nice one, Oda/@comment-3202520-20111202170404

Obvious the only explanation is the plot twist plot twist no mi that allows authors to make refreshing plot twsits of things that apeared long ago

Mhomho, arlong, and now the sea kings that apeared way ago in the series are reapering to remind old readers of them

it's more of an easter egg fo us old readers the more recent ones won't get it