Problem
Seven Stars Sect.
Shen Yu had spent quite a lot of time to think of a way to deal with it. He could just forcibly take over, but it would be too troublesome and he would need to handle a lot of things.
He also didn't want to repeat what happened with Wind Flower Sect so there were only a few options left. After all, Seven Stars Sect was under the Heavenly Sect Federation and after what happened with Wind Flower Sect, they had been keeping eyes on every sect.
So, unless they destroyed the whole Seven Stars Sect, it would be impossible to not become enemies with the Heavenly Sect Federation, which he didn't want to do this early.
That was why a hostile take over and destruction, both were out of the way. But he had gotten an opportunity to deal with the Seven Stars Sect easily without alerting others.