User blog comment:Hfc2x/HUMANITY'S WORST NIGHTMARE/@comment-12642484-20131126224322

To be fair, the anime team could be wrong here as well, although going by the fact that Isayama worked together with the anime team sometims and that Kodansha is had some minor translation errors, Kodansha seems less credible than the anime, however that is nothing more than guessing and therefore has no real weight. This is why I think that there should be a seperate policy to set up an information hierarchy.

But couldn't actually someone just check the gender-specific traits, as it was done with Hanji/Hange? If I remember correctly that was the only real evidence in that case at all, so maybe it works in Nanaba's case as well?