Huang Xiaolong didn't eradicate the specter that possessed Xuanyuan Ba because a sudden inspiration struck him; he intended to use the method of "reincarnation through a borrowed corpse," allowing Ji Zhengyu's ghost to be reborn as a specter!
The Yin Tribe harbored massive ambitions to conquer the mortal realm. Huang Xiaolong was too unfamiliar with them, the adage of an unseen enemy against a visible one applied. Just as Ji Zhengyu perished and wished to return to life by borrowing a corpse, Huang Xiaolong prepared to make a bold attempt.
In this way, it was just like planting an undercover agent within the Yin Tribe!
However, Huang Xiaolong would not act rashly and force Ji Zhengyu.