sankou1
sankou2

1. Zepia challenged the 6th but failed. While he couldn't rewrite the system, he was able to remain in it by incorporating himself in it as a phenomenon.
2. Zepia needed the body of a True Ancestor, however, at best the body he would obtain would just be the Crimson Moon.
3. The completion of the 6th probably refers to the destruction that the alchemists of Atlas were trying to prevent.