At the time Su Xin was integrating the Six Gates system here, the powerhouse trio of Nine Mystery Sword Sect and others were already agonizingly worried.
The whole of Jiangnan Province was a mess, their control over the province was practically non-existent. Even the Divinity Transformation Realm martial artists they dispatched to mediate conflicts were treated with two-faced respect by some clans.
You three forces are indeed strong, but while I may show deference on the surface, I'll still fight if I have to. What can you do about it?
If only one family behaved like this, it would be manageable. The three powerhouse forces could just use their strength to suppress them, without fearing that they would resist.