Noah didn't volunteer for the mission out of good-will.
The cultivators of that world could control the "Breath" around them without needing a fitting individuality, and that was a power that he needed.
Human cultivators could imitate the effects of the individualities with that inscription methods. That led Noah to believe that heroic cultivators would be able to imitate laws if they mastered it.
At least, that was one of the possible applications that he could think of.
Noah needed to find a way to control the primary energy created by his destruction, so even that method didn't wholly fit his situation. Yet, he was confident that he could modify it with the Divine Deduction technique and pair it to his two inscription methods.
Also, there was the innate behavior of the primary energy carried by the mutated beasts.