First of all, he may really want to revive his brother because of his family ties, because family ties are very important in the tradition of China people. Everyone's feelings for their loved ones are inseparable, just like we do in our daily life. He must have a different view of the people he loves. After all, blood is thicker than water, so I think he loves his brother very much and can't bear to die like this.
Another is that he may simply want to use his brother to strengthen his strength. After all, everyone actually has his own selfish side, and his situation at that time was in urgent need of someone to help him become bigger and stronger, and his brother was definitely a very good choice, so he also wanted to make him stronger by restoring and resurrecting his brother. In fact, it is also reasonable to resurrect with his brother and help his brother come back to live. His brother will be very grateful to him and will help him. This will also give him the best of both worlds, which will not only satisfy his brother's resurrection, but also make him strong.
Finally, I think no matter what kind of ideas he has, we should respect the characters set by the director. After all, we are not the characters in the play and can't understand their thoughts. In fact, all this is our guess, and the reason why the director set this plot must be to enrich the plot, so we must respect it and respect it again.