The higher the risk, the higher the reward. Soverick had help in ending the era of the gods and he was rewarded with a stake in the plane. The Tree father, Helios, and Aeternus subjugated the plane on their own. They were rewarded for their efforts with total control of the plane.
There are pros and cons to the different situations. Soverick will continue to have help from the racial council when the era of conquest comes but Legion will be on its own regarding the Zargoth plane. Virut plane is also much stronger than the Zargoth plane. So even though Soverick doesn't have total control of his plane, his plane will surely perform excellently in the era of conquest.
