Dissuasion

Bai Wu turned to look at Wu Yi. How can he not know that these two are doing all their best to dissuade him from takin in an apprentice? With his sharp mind, as well as his familiarity with his younger brother and his best friend, he naturally has noticed since earlier that the two are trying to stop him from taking an apprentice. 

Of course, Bai Wu knows that taking in an apprentice is only filled with disadvantages. There might be some advantages about it, like having a new competent and familiar ally, but, that was because you trained this ally with your own hands, which is very tiring physically and mentally, and also emotionally since this apprentice that might soon to be your ally is disobedient. So, the losses outweigh the gains. Not to mention that this ally might still be able to betray you in the future, thus, it wasn't worth it to take in an apprentice.