if maadra knows how to release the endo tensi he should know how to use it. what if he brought back his brother and he is tobi, it would explain why tobi know so much about everything. if tobi not his brother do he bring back his brother to rule the world with him. if he really know endo tensi then the kages are putting the world in danger fighting him because madara kills them all and bring them back endo tensi naruto and sasuke both will get beat down trying to stop him. who else thinks madara might know endo tensi i would like to hear what you think nb fam