Yes, if it's just the Great Tang Prison, Yuchi really isn't afraid right now.
The Great Tang Prison might be similar to the Yatian Sect. Since he can handle the Yatian Sect directly, the Great Tang Prison shouldn't be a problem.
But the Great Tang Prison is different from the Yatian Sect. The Yatian Sect, once destroyed, is gone, without worrying about other things. Furthermore, the Yatian Sect is far from Xufu Town, so even if things went south, it wouldn't be blamed on Yuchi.
The Great Tang Prison is another story.
Firstly, the Prison Director must have friends, and secondly, the Great Tang Prison is right outside Xufu Town, making it really difficult to quietly take it down.
"It seems I can't break into the Great Tang Prison from the inside. The prison is stricter than I thought, so I'll have to try another way: approach it from the angle of a sect and see if we can share the mining rights outside Xufu Town."
