Board Thread:News and Announcements/@comment-28489947-20161110034305/@comment-29547066-20161110195154

Erimus wrote: Asking out of curiosity, not because I think it's wrong--what's the reasoning behind people guessing Kogarasumaru? Shouldn't a crow be dressed in black? (Then again, above, I was in favor of the Himezuru guess, even though a crane ought to be dressed in white.) Well they're not basing their guesses off the name, but rather who owned the sword. https://twitter.com/rio447/status/796552807276908544

Here's an example of a possible speculation as to why they think it is Kogarasumaru. The tweet is in Japanese tho, but to sum it up, they say it's because the red clothing is related to the House of Taira (Heike).