Even though the Dragon God has a few more worlds other than this grade 1 dragon world under his control, he didn't want to lose the entire army for the world because it would affect the upcoming world assessments.
The stronger the natives of the world, the easier for them to pass the world assessment.
Since this grade 1 dragon world was his favourite permanent apostle's world, the Dragon God had spent a lot of resources on it compared to any grade 2 and grade 3 worlds under his control.
That's the reason why there were so many supreme-ranked dragons in this grade 1 world compared to the other grade 1 worlds.
Moreover, the Dragon God has high hopes for his apostle and this grade 1 dragon world. So, he didn't want a mere low-level supreme-ranked human to mess them up.
[Huh? The remaining four dragon rulers under my apostle have arrived along with their armies. I think they will take care of him].
