If, just for the sake of keeping Wu Zilin, Principal Lu affected the whole team's performance, it would be as good as offending the other three principals and Han Zhuoli at the same time.
It would be fine if their team won. Even with such a discordant character like Wu Zilin around, if the result in the end was still a good one, they would not pursue the matter with Wu Zilin too much.
But the moment they lost, no matter what the reasons for their loss were, Wu Zilin would definitely become the most important reason.
Even the whole Donghua Academy of Drama would be implicated in the blame.
So, no matter how he considered it, Wu Zilin had to go.
