well now this is a plothole....

You will notice that when Inuyasha is fighting with the new Hyoga he uses his Backlash Wave technique, which is all all fine and dandy....but where is Sesshomaru's Tokijin sword? Sesshomaru gets that sword well before inuyasha learns the backlash wave technique, yet there is no sight of it in this movie, which means it must take place before Sesshomaru got his Tokijin.
maybe they forgot to draw it into the scenes, who knows