In reality, Yi Chen isn't particularly convinced that the Ninth Disaster can restrain the entire Sick Focus and disrupt the epidemic's ecology.
The Pathogen of the Sick Focus has strong competitiveness in the biological domain. Take the Death Plague, for instance; any microorganism attempting to neutralize the Death Plague will perish. As long as this Zombie Virus has microbial traits, common sense dictates it will inevitably be neutralized by the Dead Plague Fog State Bacteria.
Apart from the Death Plague, the Sick Focus has many highly competitive pathogens.
Compared to the saying that zombies can restrain the epidemic, Yi Chen leans more towards the idea that William wants to use this zombie to accomplish a 'big task.'
This is precisely why William has mentioned this issue many times, and now, by leveraging the growth and transcendence possibility of the First Disaster, he further emphasizes the importance of the Ninth Disaster.
