Is that Tobi is obito

Answer 1

Yes. Tobi's identity was finally confirmed in issue 599 of the manga, as Kakashi's old team mate, Obito Uchiha.

med by himself and several other characters. (such as Itachi and Kisame).

That may be true (I believe it). But you also got to look at the evidence hidden. First off Tobi's teacher, the fourth hokage, uses teleportation jutsu, and Tobi has somehow improved that jutsu by dodging and escaping everyone's attacks. His right eye is only shown through his mask and that's the eye obito didn't give to kakashi. Now i don't know this for sure but something, or someone, along the way, when the enemy ninja used their earthquake techinique and left obito buried in rock, might've saved his life (use your imagination, they might explain it later on). Oh and of course Kishimoto wants us to figure out that he is obito because the name's closely related to Obito, it's not to challenging to figure out because it would be harder to explain when he DOES explain why he picked that name. ((READ THIS OVER A COUPLE OF TIMES TO ACTUALLY GET WHAT IM SAYING XD)

YES,because here is one(1) proof , kakashi's sharingan(left eye) from obito, has power that is whatever he sees it can transfer anything in other dimension/place , and just like madara/Tobi/obito can travel anywhere by dimension by using his sharingan (right eye). They're both using the same sharingan and powers ('cos it come to only one person, obito, and obito himself is madara/Tobi). Kakashi (in manga/anime )can't actually do what Madara/Tobi/obito do 'cos he is not original uchiha, and only true uchiha can perfect the power of their own sharingan.