Only one planet, only these as reinforcements, it's hardly worth traveling such a long distance.
But later discovered these insect swarms were already in chaos, obviously after the Brain Worm was assassinated, slightly changing Zeratul's perspective.
Having personally killed a Brain Worm, he naturally knew the strict level of its protection, and the specifications of the insect swarm he once killed were far inferior to this magnitude.
Such circumstances that permit the decapitation of a Brain Worm are enough to illustrate the potential ally's strength!
Perhaps, they just lack in technological advancement but actually possess immensely powerful individual strengths?
This doesn't seem impossible either...
