I know that several characters in the story use this skill which is a high level skill but is Ryuu the most gifted in this skill because Lefiya knows this skill, and she was amazed in Ryuu's skill in this art.
I know that several characters in the story use this skill which is a high level skill but is Ryuu the most gifted in this skill because Lefiya knows this skill, and she was amazed in Ryuu's skill in this art.
That's the implication. Lefiya thinks that Ryuu is better than Riveria, that means she's more or less the best.