Even if Zhou Tian and Diligence's actions were swift, they still wasted a lot of time in that world. Back in the Divine Realm, Zhou Tian and the Undead Divine King's priority was naturally to protect their foundation.
Their urgency to return to the Divine Realm stemmed from the concern for their foundation there, especially since they were up against the Space God King. Combining their strength to defeat the Space God King would not be difficult; even individually, they weren't afraid. But if their deities faced the Space God King instead of them, both Zhou Tian and the Undead Divine King knew their subordinates would surely be at a disadvantage.
Knowing their deities couldn't match their enemies, Zhou Tian and his allies had to aid them.
