Wait, I see people mentioning Madara and Tobi as different persons. Did I miss something?

Also, what could make "Madara" make worry about Kabuto summoning "his" body, could be that Madara is not Madara, but his brother. After all, the current Madara is the one that told us all the stories from the past, could be all made up to cover something. So, showing that Madara is actually dead could make that guy worry.