It can't be Obito because 1- One of Obito's eyes was literally crushed under a boulder 2- Kakashi has his other eye. 3- Obito is an insignificant character as a whole that was merely used to explained how Kakashi got his sharingan.
Anyway, Madara is Madara, I don't see a reason to doubt this. Itachi believes it, and the old as dirt (Tsuchi?)Kage recognizes him during that meeting, iirc there were others that recognized him right away from his chakra.
It was even explained how Madara have stayed young and alive all these years as well. There's no doubt in my mind that Madara is who he says he is.
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