Every major family had sent a small number of core disciples to participate in this expedition. These core disciples were asked to lead the ordinary disciples. Besides leading the other disciples, these core disciples had another purpose in joining the expedition-to train.
It was impossible for a sapling to grow into a towering tree without wind and rain. All the major families understood this. Therefore, the core disciples of their families were not only kept at home and not allowed to go out. Trials, life and death trials, were indispensable.
The reason why Mr. Tang said that fewer people should stay outside and more people should go to the planet was to remind Ji Wuming and the others that it was best for the core disciples of each family to stay outside. The battle outside was between the great ritual implements, so cultivators might be safer outside. If all the core disciples were sent into the planet, the danger would be greatly increased.
