Fight the Primal?

Michael was in no rush to fight the Primal. His body was still getting used to the changes, and it would probably take a while to finish everything.

Nonetheless, he told the Rebels to check the Beginning and observe the Primal. If the Primal split up, Michael would attack them, but not before that. Not now, at least.

He left the Will's home in the sky above the Origin Expanse and returned to his territory.

The energy permeating the Untamed Jungle was several times denser than it used to be as an Ancient Region. This didn't surprise Michael as the Origin Expanse's Pillar, the Expanse System, provided Michael with enough intel about everything revolving around the Origin Expanse. 

Michael was also fully aware of the things he could do with the Expanse System, the Expanse's Essence, and the Origin Expanse. If it was his plan to expel everyone from the Origin Expanse, Michael could do so. That was an easy task.