My bet was always on Madara's brother.
But did Madara really say that he killed him? Or just that he took his eyes?
Kishi could troll us and switch back to Sasuke or the Kages for another 100 chapters before revealing.
It's out folks
There's got to be more to this reveal than meets the eye...no pun intended.lol
I can't buy at the moment the original Obito is the one that ended up becoming Tobi since not only was Tobi presented in being much older than what Obito was supposed to be when confronting Minato during the night that the Nine Tails was released, but it was also stated that Tobi was the one that gave Nagato is Rinnegan, and Nagato is roughly the same age as Minato.