Bab 1396: The Gap Of Darkness.

He said with a proud smile as he watched, "Their reproduction is slow and their fertility is poor but they sure spread like fleas."

Every action of dragons has something to do with him. Their impressive actions particularly also make him impressive. After all, he is their source of greatness. So he is proud whenever he sees how well they are doing. 

Dragons have done especially well in spreading and dominating their environment. They have poor reproductive capabilities but their numbers have swollen beyond the trillions after so many Origin cycles since their creation. 

So it is difficult to examine all of them and he rarely does so. If not for the Overgod then he wouldn't have bothered.