A Rebellion Within Ziyou!

It was a widely known fact that not only was this son of Wu Lie bereft of a cultivation base, he was also an invalid. His was disabled from the waist down, and had even lost his sight for quite a while - it was only due to someone's kindness that he had managed to regain his sight and was able to see light again. Besides these traits that had been mentioned, there was another impression he seemed to give - he did not seem altogether too bright; in fact, he seemed to be somewhat dim-witted.

What was the use of a person like this, even if he could revert to the condition of a normal man?

How could a person like this manage to grab Wu Ying's attention? Or, in other words, what in the world were Wu Ying's standards like?