I never noticed this in OP 12 : r/OnePiece

One Piece Openings tier list : r/OnePiece

One Piece Releases Opening Animation For SEKAI NO OWARI's The Peak

One Piece Anime Hits Its Highest Point So Far in SEKAI NO OWARI's New Opening - Crunchyroll News

One Piece, Opening 22 - OVER THE TOP

One Piece Shares Details for New Opening Theme

One Piece Opening 24 - Straw Hat Pirates (2) by ThonyGrpl on DeviantArt

One Piece Debuts New Opening and Its Absolute Fire

One Piece, Opening 14 - Fight Together

One Piece Opening 23 Sheet music for Flute (Solo)

One Piece – Opening Theme 26 – Fighting☆Stars