Yes, but he also helped create the biggest alliance of shinobi in history, something that will be the start of a new era of peace (if they win the war).
Obito didn't quite bring them all back together. Kurama and Hachibi are still separate. But, you are right that Obito's role has effectively been the opposite of the So6P here.
But in chapter 638 he clearly has both his eyes. I don't think he used Izanagi here. I think instead that he sealed the Juubi before he died, and the healing power of it (remember how quickly Naruto heals from wounds) was enough to save his life. Remember that Obito's body is mostly Hashirama cells, which have amazing healing properties.
Naruto also had a duality, which he lost at the falls of truth. Madara also has been a strong force for duality, after he gained Hashirama's powers. Zetsu too. In fact, I would say that Madara has more duality symbolism than Obito.
Same with Zetsu. Same with Madara
Same with Madara
That's just a stylistic thing, and it was only one of his masks. His other masks had no such meaning.
No. Obito in the past two chapters has been revealed to be a mindless killing machine, with almost no intelligence left and an incomplete control of the Juubi. Also we see that Madara still has a "trump" card ready for this situation, which supposedly will return his plan back to it's original course. The fact that Madara is distracting Hashirama away from Obito, and that Madara isn't acting concerned by these developments is proof that he's the one really in charge and that he still has a plan. Madara is the next sage, and he's going to be the "final boss" when Obito is done being used like a pawn.
This was made before it was revealed that Obito still had his sharingan, and it was wrong speculation.
Also, every character has duality, as it is the main theme in this manga. When analyzing Obito as a character, a lot of the evidence is only supporting and it cannot stand individually, but this is an incorrect way to look at it. He is simply the only character to be comprised of both ideals, characterization, and symbolic parallels that all entirely revolve around duality, without requiring another character.
We cannot undermine the fact that he is an inheritor of both the Will of Fire and Curse of Hatred, and Kishimoto reminds us of that through Madara and Kakashi hinting that Obito wanted to see the results of Naruto's Will, when he was still connected to the Juubi. The physical characteristics and character symbolism just further support the consistency of his duality. Kishimoto has just designed Obito as a character that didn't rely on a foil character for development (Especially during the Tobi, Madara, and No One phases of his character, and even now, Kakashi hinted that that his motives for what he is doing is actually because he is essentially fighting his younger self). Obito was designed with a bit of both ends of the duality spectrum, hence he is No One. Other characters have had minor duality themes within themselves, but Obito's character is ruled by it.
It's time to let Madara go. He is not duality, he is part of it. He is ruled by power. His physical manifested Will is the power to dominate others. He fits the more classic idea of a final anime villain, but the problem is that if we are aiming for a SO6P character, he fits more in the Elder Son category. Madara's character and development as developed through the story has been highly dependent on Hashirama to balance the character's highly polar ideals and characterization. He is an Elder Son, and most likely will not trump Obito, for his resolution lies with Hashirama.
Obito is the one that has committed the feats to be compared to the Sage, and Madara has feats, ideals, and character development to support his position as an Elder Son, meaning that he is dependent upon Hashirama's actions and vice versa. From a theming perspective, I cannot see Madara trumping Obito without Obito being able to overcome it, most likely through his stronger will again.
I do like your first point, however. Obito is laying the ground work for peace and the new shinobi world for Naruto and Sasuke to create. Kind of like the Sage laid the ground work for both peace, and the conflict between the Elder and Younger Son eh? =D
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