The help of the Fawkes was quite complex. It required a level of manipulation that was only possible thanks to the God Beasts of Creation.
Of course, the God Beasts of Creation didn't act directly, or else the favor wouldn't be owed to the Fawkes in the first place.
Instead, it was rather related to the God Beasts of Creation by proxy due to the uniqueness of Humans.
It had to be remembered that before choosing the Human Race, the God Beasts of Creation had tried to create Envoys of Creation with all sorts of other, seemingly much more powerful Races.
However, in the end, they failed every time.
It was simply impossible to get another Race to take on the strength of the Beast Envoys, let alone they as Gods of Creation themselves.