Ah jiwon, a point I must raise given your last post.

I know that Ryuunosuke is more of a scholar than he is a warrior, so he'd be rather well read and intelligent... however, to be able to decipher on first looks a cypher, inspect a new economic model for accounting and instinctively understand how it works and its advantages seems like more than a bit of a stretch. That clearly higher than even genius status and that's not how I read the character at first. I think he'd only be able to understand that it is a cypher and then need to ask what it is about.