Yang Yi could have transferred Chris to the maximum-security area if he wanted and if he was willing to pay a certain price.
Why did Yang Yi want Chris transferred to join him in the maximum-security area? Because Yang Yi felt that he could actually learn a lot from a con artist.
The information Yang Yi had gotten from Owen was confirmed: Chris had indeed smoothly deceived many people, but eventually, while in the midst of a big deal that had been largely successful, he slipped up.
However, Chris did lie about one thing: he was not as harmless as he had described himself. In fact, when a former accomplice tried to extort him, Chris didn't choose to avoid disaster by losing wealth or use money to shut the informer up. Instead, he chose the most decisive method—murdering the accomplice who was blackmailing him.
Chris had successfully gotten rid of the person extorting him, but nobody knew how he had done it. Moreover, nobody knew whether the betrayer was dead or alive.