Dude, don't hire him. He couldn't save his own sect and then punished half his world's population. Most of which had nothing to do with it. He saw someone being harassed(sure an act) and did nothing. Dude sucks and is also super dumb. Just let him cultivate and go back to shit on his own world. Sure he's strong, but villains can be strong too. Should they hire villains as instructors just because they're strong?