Board Thread:Naruto Discussions/@comment-30762323-20180720171651/@comment-25122992-20180720203222

@Jason of the Mangekyou, Madara only stated that the whole show with kidnapping Rin was his own plan. Plus, he explicitly mentioned he would've made Kiri Anbu kill Rin before Obito's eyes if Kakashi hadn't happened to kill her first, so it's obvious that Isobu's rampage wasn't any use for him, since the main goal was to corrupt Obito.