People need to stop crying about Tobi being Obito. It was a nice surprise, and the clues were all there. Tobi... add an extra O and fix the letter... and you get Obito. Here's what I think:
1. I do believe that there were possibly two masked men. Obito would have been 14 during the nine tails attack. There is no way he could get as tall as the 4th in one year... and there is no way his skill level could sky rocket in one year after his supposed death. WE STILL DON'T KNOW WHEN THE REAL MADARA DIED!
2. Look at the Ame Orphans. Nagato got his Rinnegan as a kid, correct. Obito was not born yet. Yet, Obito/Tobi claims to have given Nagato the Rinnegan.
3. In one chapter (don't remember which one), but Itachi even said that Madara was a shell of his former self.
There has to be two masked men... or Obito is just one gigantic liar, lying to everyone to get what he needs (probable). Still doesn't make sense how he suddenly grew when he fought the forth, or how he has extensive knowledge of the past, or how he could have even known Nagato as a kid.
Final Statement and Question:
The 4th Hokage must have a been a terrible hokage (don't get made at me

). From what I remember, I read/heard somewhere that Zetsu used to eat the bodies of the fallen Akatsuki members to prevent secrets getting out. I also read/heard somewhere that corpses have a lot information on them. Keeping that in mind, why wouldn't the 4th Hokage and his team (Rin/Kakashi) remove the boulder from Obito and take the body with them?
With a body containing such a sensative item such as the Sharigan, you wouldn't want it to fall into the wrong hands.
And if I were Obito, and my team also abandonded me like that while I was still alive, I would be pissed XD!