Hey guys, i've been lurking around for a while and decided this was a good time to join.
I have a good theory as to why Tobi is Obito, and I was apart of the Tobito theory supporters from the beginning. Here's the deal..
Tobi is Obito
Obito gave his eye to Kakashi and they were told to run, leaving Obito to die
Obito passed out
Obito was saved by Madara Uchiha at The Battle of Kannabi Bridge
After Obito woke up, Madara had already attended to his wounds, his eye sack, from which his eye to Kakashi was torn out, is shown to be sewn, and his right eye intact, although his right side of the face seems to be bruised a lot
Obito was burried in Konoha with an empty grave
Madara became Obito's mentor
Obito was brainwashed in the long run into accepting Madaras ideals
Madara was the one to come up with Tsuki No Me
Madara was the one to attack Konoha 16 years ago, wearing the mask
Madara died after unlocking Rinnegan (is not explained how he done it) and overusing it by accident
Obito became Tobi
His mission was to carry out Madaras plan
He was given all the information that Madara possessed, thus the extent of knowledge Tobi has about everything
He was trained by Madara