Calm Heart Sutra
Ryu checked through Ariad's techniques first. The latter had what Ryu deemed to be a close combat type Dao so he believed that Ariad would have some interesting techniques to go along with it.
What Ryu noticed between Ariad and Leolar was that their Daos were actually quite bare bones and simple. This made sense considering their low grades, but what was more interesting was how that correlated.
As Ryu had said, Leolar's Dao had been formulated by observing a Roc. Truthfully, Ryu didn't believe that Leolar had observed a real Roc, it was more likely that he had observed some sort of simulation of it, or he had based his deductions on a technique that claimed to represent one.
Because he was curious, Ryu had cross referenced with Sarriel's notes and he had learned that Ancestral Beasts were just as rare in the true Martial World as they were on Sacrum, and their standing was just as high.