I was thinking about what madara could be plotting to do with sasuke and i came up with this. Maybe madara needs sasuke to defeat naruto so that he could release the fox from naruto. If madara fights naruto and uses his sharingan i believe the fox will take over out of anger and revenge for being used by madara. Some will say the madara can control the fox but i think he cant control the fox while its in naruto. He can control the fox but in naruto's case its is the fox's charka the naruto uses.Tell me what you guys think.