Naruto-Who Really Is Tobi?

On a lighter note, the question that’s been puzzling all hard-core Naruto fans is…”WHO THE HECK IS TOBI?!” After several analysis’, I can only come to one conclusion, Tobi could possibly be Danzo’s team mate from his 3-4 man cell. Sorry for the spoiler however if you’ve read Naruto recently this shouldn’t be a problem. Tobi obviously can’t be Uchiha Madara because he was resurrected by the ‘impure resurrection’ technique and it can’t be Obito because he has no reason to destroy Konoha.