Fandoman goes on a long ass explanation as to who Tobi is and isn't, stating at the end that he is clearly Obito. Apparently he doesn't remember the few times that Tobi was in the presence of Kakashi. If he were Obito don't you think that Tobi would have acknowledged Kakashi a lot more? After all, Kakashi did take his eye.
Fandoman also talks about how he thinks Madara is just a bunch of people claiming to be him throughout the years... BULLSHIT. There is no way that many different Uchihas were THAT powerful to even be considered as Madara. Both Sasuke and even Itachi trained their asses off to get where they were and yet they are nowhere near having the power to control the kyubi or transport through space. And Tobi has made several comments to people about not wasting their time attacking him because he knows they're absolutely no match for him. So NO, there's no possible way that Madara is several Uchihas throughout the years claiming to be him.
I'm still not sure on whether Tobi is Madara or not, but I know he can't be Obito and Madara isn't several people. Common Sense alone can tell you that.