The seven Zeniths were all exceptional individuals who emanated exceptional demeanors and alchemical auras. Their eyes were all naturally the Alchemic Stars of Transcendent Purity, allowing others to validate their phenomenal feats and alchemic ability with a mere glance. They represented the peak Alchemic Dao of the Utmost Purity Galaxy's long-lived alchemical lineage that was, by both willing and reluctant admission of every lesser and greater galaxy within the cluster, the apex authority of alchemy. Undisputed elites without external equals.
While they weren't kings, queens, emperors, or empresses of their respective galactic zones, they were the unrivaled authority within by virtue of their Dao Enforcer and Alchemic Dao. In matters of alchemy, all disagreements were settled through clashes of the Dao, and who could confidently compete or outclass any of the Zeniths? This, by extension, granted them unquestioned authority.