It seems that what the Forest Ocean Spirit wanted him to predict was whether there would be any issues if it expanded beyond the South Ridge, whether it would attract others—such as a strike from the strong individuals of Terra.
Don't be fooled by the fact that the Forest Ocean Spirit can almost dictate the growth and withering of all plants in the South Ridge; at the end of the day, it's at most a Fourth Energy Level entity.
Truly angering the Humans? A few Grand Knight Order expeditions would be enough to drive the Forest Ocean Spirit away.
Killing it would surely be difficult; if it truly sought to flee, it would be impossible to kill. But expelling it? That's another matter entirely.
The Forest Ocean Spirit was an "alien species" recovered by the Redwood People from the Sparks.
Realizing the exceptional psychic capabilities and immense potential of this being, the Redwood People did not abandon its cultivation even after leaving their base.
