Re: Naruto Manga 512 Spoilers / Summaries
For all those confused, here's the way I see it. Madara told Kabuto the Demon Sealing Statue (Gedo Mazo) is alive, and on it we see pinned the "lifeless doll," as Madara refers to it, of Hashirama Senju. Now, would it be too much to suppose that perhaps Hashirama Senju is the Gedo Mazo?
In other words, when Madara told Konan "I fought that battle [against Hashirama] to gain access to his abilities," he might have meant he did so in order to utilize his Mokuton ability that allowed him to control the tailed beasts (the Gedo Mazo itself is wood, is it not?). Madara himself said to Sasuke that Hashirama came into the possession of all the tailed beasts at one point in time (implying that he had power and authority over all of them), and split them up amongst the five great nations to begin peace talks with them.
And now, Madara is using Hashirama as his test subject, sealing the tailed beasts into the Gedo Mazo because the statue, combined with Hashirama's DNA, has (or once had) the ability to keep the beasts sealed and in check. The statue itself, perhaps, is not able to maintain and contain all the beasts that are sealed inside it, but coupled with Hashirama's DNA, has the faculties necessary to do so.
But that's my opinion on the matter. It could be wrong, of course, as this just my idea of what Madara was telling Kabuto. But in any case, these look to be interesting spoilers, and that usually leads to a magnificent chapter.