That's why it's really strange that Obito was caught off guard. He exactly knew what the black rods are,he also knew that they are in his body (he even used them in this fight). Perhaps he believed that he could resist Madara's will, or he really is dumb. Which would mean all his insights, great thinking, planning, buck up plans and other things that seem near impossible for Madara to predict and had to be made on the spot, seems like come from Black Zetsu. Sure, it was meant to support Obito, but as it seems, it actually did all the thinking. What's more, thanks to the Black Rods inside Obito, it might have even channel it's own thoughts, which Obito perhaps believed to be his. It would explain why Obito moved and talked like a Zetsu at some points in the story.
Obito was totally unaware of the black rods being used this way, although he probably should have suspected it. Note that at the time he talked about syncing Sasuke, he had no plans of bringing Madara back. Madara's Edo resurrection threw a spanner in Obito's plans.
Obito probably had a different way in mind for syncing Sasuke without the rods.
Also I can accept the chance of Obito being influenced by the Spiral Zetsu/Black rods, HONESTLY that would make more sense and ease some of my uneasiness about Tobi=Obito.
If Madara is capable of manipulating Obito is such a manner because of his link to the Zetsu's then isn't it possible that Madara will be able to do the same to the Hokages dead Zetsu Victims? If so, then that Barrier will disappear and so to would the Hokages. Also, I wonder who is going to be revived. I don;t know how Madara can be revived if his soul is already sealed in a dead corpse with the Edo Tensei jutsu. IMO its going to be someone else.
Also after some thinking, I realized that the SO6P is a real dick. The Juubi was just minding its own business when the SO6P attacked it and ripped it into pieces. The way I see it, the Juubi is just an entity without emotion, so even if it did kill a few people, it didn't do it on purpose.
Nevertheless, I'm rooting for the Juubi from now on. Naruto be damned.
I had always expected that Rinnegan Tops ET. The Rinnegan can Suck a soul out of its body, like Nagato did in the invasion of Konoha, and when Danzo and Hanzou attacked Nagato and company way back.
In addition, to answer your question about Madara controlling the Hokages via the Zetsus used in the ET tensei that brought them back.
Well Not So, my friend. Edo tensei Reformats the Sacrifice using the DNA of the resurrected person. The Zetsus that were used have been reformatted on a DNA level, I think this would prevent Madara from controlling the Hokages.
Obito better not die like a pawn in Madara's hands. That would be a really dissapointing end to his character.
Okay something interesting just hit me in that another reason that Madara's revived real body will be weaker than his current one is because Kabuto's altered his current Edo body with "Hashiramaface" based on Orichimaru's research into Hashirama cells. This is more advanced than the Madara version of implanting Hashirama cells.
This may show up when he tries to use Mokutan abilties only to fall short of what he was capable of in his Edo tensei version. Not that he needs to rely on Mokutan with the Rinnegan and EMS. I suspect he will suck out the remaining life force in Obito to revive his youth.
There are certain things Madara has to be weary of.
1) If he made the Hashirama clone to be his new body, he has to ensure that his soul is revived to that body, and he cannot do it where he currently is and not expect interruption by the Ninjas.
2) He has to make sure that his old Rinnegans are available, except if he's already grown duplicates of his eyes in the Hashirama clone
3) He has to Make the Juubi's chakra go into the Hashirama body.
Madara has to do all these things while Naruto, Sasuke, Hashirama, Yondaime, and the Revive 5 kages are standing around twiddling their thumbs.
I think Madara may know something we don't about his resurrection. I think there may be just a little more to it then just becoming applicable to be the Juubi's Jinchuriki.