Because the Soul Formation elites who had entered the 300 small worlds in the past could not bring the memories of the small worlds back, no cultivator knew about the situation in the small worlds.
Zhu Wuyan could only make plans based on the words in the past books and his own speculations. As for whether this would succeed, Zhu Wuyan was not very confident.
However, according to the ancient books left behind by the Thousand Poisons Sect, there were indeed Divine Transformation Realm elites who had earned more than 100 World Origin points in a small world when the 300 worlds had opened in the past.
Since others could do it, it didn't mean that Zhu Wuyang couldn't. Therefore, after careful consideration, Zhu Wuyang came up with the most likely plan.