youve only heard rumors of the japanese version whereas you know for sure what the american version says. if you looked this up on zeldawiki and no one has mentioned him being a girl in the japanese version then its probably a false rumor.
i dont understand how it makes more sense. the only reason i would think that he could be a girl is because hes purple. other than that i see no problem with him being a boy. there are no "bumps" and its such an insignificant thought that i dont see how it matters either way...
think of it this way. its a tiny detail. if you have to think this much about something that is this insignificant than the chances are it really just requires no thinking at all.
i think that its what it meant to be. looking into stuff too deeply is overkill. a girl being into another girl in zelda? not likely. if its a guy, they meant for it to be a guy.