I think in the novel its a more of a surprise with the master's wife, since here they show her and all but let you know she is
. Since you didn't see her in the novel it was more of a surprise.
Question to Novel readers who are far ahead, is there ever any great mystery to Leon's actual parents, or is he just an orphan because that's cool. I feel like it is too odd he gets adopted by like the sword master of the empire and his wife, see spoiler above, and he is so broke in terms of power even compared to dragons, to not be more to his parentage.