With An Zhiqiang's testimony, it was sufficient to apply for the arrest of Zhang Yi.
But the key to deciding whether to bring charges was whether the subsequent evidence could keep up. Otherwise, when the time came, they would still have to release the person.
Jiang Yuan and Liu Jinghui, based on the evidence at hand, had assumed that the victim was Liu Hongbing, who collected clothing for a living. This was still risky, as much of it was speculative and based on facts from six years ago.
In a normal investigation, this sort of hypothesis wouldn't be an issue—it was just a matter of forming bold conjectures and verifying them carefully.
As for now... there really was no difference; they still had to make bold conjectures and verify them carefully.
Wang Chuanxing was quickly dispatched to Jianjiang City to locate Liu Hongbing's family and investigate the situation.
The investigation in Ningtai County was handed over to various individuals for implementation.