Gion is a Vice Admiral within the ranks of the Navy. She definitely has Admiral level potential, given that she was one of the candidates for attaining this position during the timeskip.

Vice Admiral Jerry Kyd was educated at The King’s School ... Across a 37-year career, his commands at various ranks have included the Type 23 frigate HMS MONMOUTH, the strike carrier HMS ARK ROYAL, ...

Gravely Jr. was the first African American to take command of a Navy combatant ship, and be promoted to the ranks of commander, captain, rear admiral and, finally, vice admiral. Nearly 200 11th ...