Board Thread:Naruto Discussions/@comment-1514283-20140829001753/@comment-1210805-20140830134707

Context is the most important thing here. The databook said that Tobi was Madara because that's how he was being treated at that point in the story. Kishi's hardly going to spoil his own story in supplementary material. The Chidori separate pages for the Chidori and Raikiri are completely different. Their separate listings and different ranks both show us that Kishi considers them different, albeit closely related techniques. If they were the exact same technique they'd have the same rank.