The early fall of the meteors was indeed the butterfly effect.
The insectoid race might not be technically intelligent in the way humans were, but they had their own advantages.
For one, even if they were all hibernating at this time, they had mechanisms that would send signals to their main ship— which was also an organism, in a sense—if a major abnormality was detected.
When Naia and Kael were transferred there, the humans might not have detected it, but the aliens did. When the anomalies in the space-time caused by their arrival were detected, the ship's mechanism determined that it was better to move in advance.
Fortunately, it still needed energy to do so, otherwise, the aliens could've attacked the moment Naia and Kael were pulled back to this time period.
In any case, at this time, three massive asteroids—each one as big as a large mountain—headed straight to the planet.
