Mo Wangchen left Ming Country with Yaoyao, but before leaving, he still handed over the Alchemy Recipe for the Vein-Sculpting Spirit Pill to the elder.
As stated by the elder, the Crown Prince's meridians were damaged and could only be recast painfully to be repaired.
Yet, if the Crown Prince was to ascend to the throne, he could not be a cripple for life, incapable of commanding awe throughout the court. Only by repairing his meridians and furthering his cultivation, to give the court officials a glimpse of the Imperial Dynasty's future hope in him, would they unite to weaken the power of the National Marshal Mansion.
Otherwise, should the National Marshal march on the County Capital and usurp the throne, this would undoubtedly bring suffering to Ming Country's common folk—something the Crown Prince did not wish to see.