For the Abyss World, the growth of its internal living beings is indeed a good thing, but for the entire world, at that time, although the growth of those living beings cannot be said to be completely without effect, their impact was not as significant as imagined. At the very least, for that growth to play a role in the Abyss World, it would definitely require a long duration of Diligence to be effective.
With Zhou Tian's presence, there's actually not much need for the help of those Abyssal Creatures for the Abyss World to grow. But even with Zhou Tian's presence, after the previous battle with the Divine Realm, certain Gains were something the Abyss World couldn't ignore at that time no matter what.
