this is masterful story-telling. this whole time i was made to believe Fukubei was one of the original members, while also not directly coming out and saying he indeed was. subtle hints of a connection, throwing his name around, exposition, then boom- forgettable...
until of course, his reveal. suspicions? sure, because he came out of nowhere with the reunion. but to blend it so flawlessly into established history and the repeated flashbacks to once again throw us off the scent.
genius-level, at least to me anyway