He must move up in his position as quickly as possible, obtain power, and raise his profile in order to deal with an increasing number of dangers.
And by trading under the identity of a "Mysterious Person," releasing Larilo.
He could thus find an excuse for obtaining new intelligence in the future: the Mysterious Person had extracted new information from Larilo.
It also allowed him to share some of the credit for uncovering the truth about the "Yellow Phantom," helping Qiu Tu to advance further.
It was killing multiple birds with one stone.
So, at that time, Qiu Tu carefully planned with Tang Feifei and contacted Elder Tang.
To fool the old and cunning Elder Tang, Qiu Tu even staged a play: he claimed to be the Mysterious Person, only to be exposed by Elder Tang later on.
Humans are a strange species.
If Qiu Tu hadn't made this arrangement, given Elder Tang's astuteness, he might have guessed that Qiu Tu was the Mysterious Person.