Board Thread:Naruto Discussions/@comment-33485854-20180606215933/@comment-734582-20180607185152

Vladosaurus wrote: Not this talk again...Sasuke had his rinnegan and Kakashi had the eye that Naruto gave him in the movie.Naruto`s SPSM and Sasuke`s rinnegan debuted at the exact same time in the manga. In the Last also their showings were minutes apart.Didn`t the Last also appear before the manga was over? You're comparing thinks that take up mere minutes of screentime (and thus animation work) compared to Naruto, who spends both a long time and considerable (and complicated) action sequences in his mode. Rinnegan Sasuke or Hokage Kakashi can be drawn in a short time near the end of production.

Production of a movie can take a long time, especially the animation itself. A year isn't much. That puts the start of the movie production around the time SPSM was introduced (give or take a few months).