The potbelly Cui Elder was getting crazy from the situation, over and over again his plans and his actions were being thwarted, and he hadn't been able to teach Cui Xie a lesson.
He had to make sure to teach Cui Xie a lesson, and the difference between their strength. Otherwise, his plan of using force to deal with this bastard nephew of his would be a bust.
The Patriarch and the family had given him the right to choose the best course of action to deal with this matter while giving him permission to use quite a bit of the family's resources.
While those things were precious, and especially the abolishment of the expel, and return to the family roots was probably the best condition, he still had wanted to close this deal through force.
In his thoughts, if he acted as the Patriarch had advised him, then Cui Xie might even have the idea of returning and fighting for the position of Young family Head of the Cui family.