For now, the evidence looks rather weak, and the wiki itself doesn't mention what this Ezo flag looks like. I also tried going further to Hokkaido and Goryokaku, but nothing came of it.
So, Heroist, what do you think about those who are currently trying to discredit you? Are there any Necromancers among them, and if so, who?
Update: In the movie "The Last Samurai," the connection is found in a footnote – is that normal for evidence?