This is actually an interesting idea. I mean, I doubt it, but my main doubt here would be realism - Ryu is competing in sports on a very high level and it would be strange for a trans man (so someone transitioning from Female to Male, what you probably meant) to be on such an elite level. But again, the only reason for this is realism and if the Dev decides Ryu is a female who transitioned to male and is really just THAT GOOD at his sports, so be it.
But aside from realism, a point for your theory would be that Ryu also trains longer than the rest of the class. Might just not be preparation and extra training, but the same reason as why MC stays longer - to hide something.