The blame on the edo tenseis falls right on tobiramas plate a.k.a the 2nd hokage. but since he is the creater of the justu, who could he have sacrifice to create such a justu? for all we know, that the uchiha was figthting the senju, but little was said on how madara's brother died. since madara was always fighting hashirama senju, could he have been getting back at tobirama? just a wild guess and assumption. but still, if madara supposebly died at "valley of end" could he possibly be an edo tensei summoned himself? could somebody be pulling his strings? just a theory. but who would have thought the second would make a justu like that? is it tobiramas fault for all of this happening?