For top-tier forces, the titles of elder and Supreme Elder were never simply about seniority.
Instead, they represented identity and strength.
In the Li Yang Cave Heaven, the Sect Leader's weight was much higher than that of forces like the Purgatory Sect and Netherworld Sect.
The stature of the Supreme Elders was only equivalent to that of the Elders during the Purgatory Sect era.
Of course, compared to the Elders in the Purgatory Sect, the Supreme Elders still had more say.
With a True Immortal present in the world, the Supreme Elders would nominate themselves, and ultimately, the True Immortal would appoint the next Sect Leader.
If there were no True Immortal, the Sect Leader would be chosen through competition and selection from among the Supreme Elders.
Whoever gained more supporters would take the position of the Sect Leader.
There's also a variable that cultivators can't avoid—strength.
The Sect Leader is often the most powerful among the Supreme Elders.