Dragon Ball God Mu - Chapter 688

... to achieve great achievements a chance to reach the heavens in a single bound. However, Muyang knew that it was too late. Therefore, he did not seal all of the God of Destruction positions in one go. Instead, he roughly retained the god positions of the nine universes.

The nine God of Destruction positions were used for the future powerhouses of the God Mu World. Even Kanalita and the others could retire early and pass down their positions if they did not have enough god positions.