Sui Xiong could only see some scenes from Ray's memory, but the amount of information contained in them was sufficient.
For example, he already knew that Ray was indeed from an aristocratic family, which was not a normal aristocracy but a big aristocracy with the right to inherit the throne. However, Ray's rank as a successor was a bit low, so it was hopeless for him to be the successor under normal circumstances. Perhaps he just had more advantages than Olian.
For another example, he knew Wall was indeed the idol of Ray. Twenty years ago, when Ray was still a child, he was determined to become a great knight-errant that punished the evil and promoted the good. As for why 20 years later he became a robber, perhaps there was a very long story therein.