In episode 315 of the Zhen Soul Street comic, Cao Ren and Yu Ban come to Luocha Street together to test Cao Yanyan, the son of Cao Huoniu, and The Emperor Fu Longdou, but there is a doubt in this, that is, only Cao Ren wants to choose the spirit sender.
From the battle and the dialogue between Cao Ren and the Cao family brothers after the battle, it can be seen that Cao Ren came this time to find a sender who can inherit himself, and the purpose is to carry forward the blood of the Cao family.

But when choosing a spirit sender, although Cao Ren adhered to the principle of choosing the strong, he would only choose one of them, in other words, no matter how he chose Cao Huoniu's son, there would always be one who would become a person without the guardian spirit.
However, Yu Ban came with Cao Ren, and the two of them could completely guard one by themselves, so that not only could the descendants of the Cao family be more powerful, but also that Yu Ban would not live alone in the Zhen Soul Street.
In fact, there are many reasons why Yu Ban and Cao Ren did not guard one by one.
First of all, although Superman is adhering to the principle of giving priority to the strong, he still set up a premise, that is, Ning Que is not indiscriminate, if the two brothers of the Cao family do not meet his strength requirements, then he will not guard any of them, because such a descendant of the Cao family is not worth protecting at all.
Therefore, if one person wins, this means that the strength of the other person is not good, Cao Ren will naturally look down on the other person, and he will not let Yu Ban guard him, after all, Ning Que is not indiscriminate.
Moreover, from the previous plot, we can also know that Yu Ban's strength is actually relatively weak, at least several times weaker than Cao Ren, if Cao Ren chooses the stronger one, and the weaker one is handed over to Yu Ban's guardian, their strength gap will be widened, which may bring counter-effects.
From the perspective of Yu Ban's duties, Yu Ban was not in a hurry to find a spiritual sender.
Yu Ban was actually the guardian of the Cao family's inheritance, and perhaps after his death, Cao Cao arranged a new task, that is, to let him inherit the weapon of the Ten Halls of Yan Luo.
As we all know, the Ten Halls of Yan Luoli collected the souls of all the outstanding talents of the Cao Family, so in a sense, the Ten Halls of Yan Luo were more important than a descendant of the Cao Family, and if you look at it this way, it is the right choice for Yu Ban not to protect the Cao Family Brothers.
As for Yu Ban's protection of Cao Yanbing later, it may be that they did encounter an emergency, and if he did not guard Cao Yanbing, perhaps Cao Yanbing would have died. And why did Cao Cao choose yu ban to guard the Ten Halls of Yan Luo? It is estimated that I don't want to become the effect of three hundred and two silver here.
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