Davis was unable to stop Azariel and Viridia since they had made their move when he was on vacation in the countryside village with his wives and little children. These youngsters had grown up and won't listen anymore. Even his lovely Viridia rebelled in subtle ways after she had turned seventeen years old. Now, she was already twenty-one years old.
Azariel was much older since he used the time chambers more than necessary to widely improve his skills. Davis also couldn't say anything about the heavy usage of time chambers since he was worried Azariel was disheartened about the prior incident with his ex-love interest, and chose to immerse himself in studying and training.
He felt it was a good thing that Azariel was focused on cultivation, but he didn't expect him or Viridian to leave. But he could understand.
If it weren't for the secret realm, they might've already stepped into the Empyrean Stage. They couldn't delay any longer, so they made their decision and set out secretly.