The reason why only 304 disciples were left on Divine Martial Peak was primarily because they needed to have absolute trust in the Creation Gate and in him, the Supreme Elder.
With their cultivation and perception, learning to pilot mechas wasn't difficult.
What was difficult was forming combat power as quickly as possible.
To quickly form combat power, Gu Jinlai could only use the "assimilation" inheritance through the Void Projection Technique.
Those who were eliminated were basically people who could not give their absolute trust and were wary of Gu Jinlai's Void Projection Technique "assimilation".
These people wouldn't necessarily act against the Creation Gate or have ulterior motives; it's just that most people naturally have psychological defenses.
Just as even the closest of friends wouldn't want to expose all their privacies to one another.
However, to ensure the smooth process of "assimilation" through Void Projection Technique, he had to eliminate those individuals.
