Before Xin Zhenyong left, he actually carefully checked Zhu Wuyan again. Only after he confirmed that Zhu Wuyan's strength was indeed only at the perfected Golden Bone Refinement and that there was nothing to hide did he leave with a cold expression.
What Chen Diandou taught Zhu Wuyang was knowledge of governing the country, strategy, geography, history, and other aspects of literature. On the other hand, Xin Zhenyong taught Zhu Wuyang military strategy, martial arts, secret arts, killing, and other aspects of military strategy.
Although Mad Emperor Zhu Zhenwu was extremely jealous of the talented, he would not take away the education and resources that the princes and princesses should have. Sometimes, he would even allow the princes and princesses to receive excessive treatment.
However, it was unknown whether this was done to confuse the princes and princesses and expose some of the more ambitious princes and princesses.