Ok well i was reading another typical person saying Madara = Obito which i don't want/chose to believe as in my opinion obito just looks...gay :L hate how he looks xD bit shallow but still xD Anyway back to topic. As i said i read this post saying Obito is madara as madara after fighting the 1st was wounded and needed a new body , and came across Obito years later and thought it would be prefect as a dead/dieing body would be perfect as it wouldn't arouse suspicion. As much as a i don't wan't to think this is true i have one problem in the back of my mind which makes me think that it could be obito.
We have not actually ever seen his body,Grave or any evidence that they recovered his corpes or wounded body. Kakashi has never visited his grave in a filler or in the main storyline but other characters such as asuma visiting the 3rd's grave and shikumaru visiting asuma's and orchimaru visiting his parents and a few others i don't remember off by heart. Which leads me to think why its never been shown if kishi show'ed all those graves above ^ why would he not show obito? especially in that "Kakashi's Chronical's" chapter surley at the end they would have shown his grave or some scene. Also where is rin? How did she die? why has there not been a story about her and her death? Unless shes might be the 6th coffin? This would show why madara was scared (if he is tobi) as its pretty clear that obito had feelings for rin and might not want to fight her. As it never states that the person in the 6th coffin is strong. Just something that frighten madara. Like say a normal house spider and a person. The spider wont do sh*t all but some people still fear it.
As i said i dont want to think this could be a possiblity but im just putting it out their as it kinda make's a good theory.
Lets here what you think ^^