It was him or madara. I have a friend that reads naruto. In early shippuden, he used to think that tobi was obito, and I used to think he was madara. When he said he was madara and started to act like him, I was like "hell yeah, told you". Then, when madara showed up, I knew it was obito, couldnt think of anyone else. Then, my friend said " haha, told ya" when obito was revelead, we read that chapter together, I was in his house studying. It made the moment eveb funnier