I still have a VERY hard time believing that Tobi is Obito. Just because he spoke like he knew Kakashi doesn't really mean much. He could be just be speaking like that because of when they met during the 5 Kage Summit arc, or he's just doing it to fuck with Kakashi. Plus, his teleport not working would only mean that Tobi has a better mastery of the Sharingan than Kakashi, and this is true.
I'll ask you this, how can Tobi be Obito, if when Minato fought Tobi during the Kyubi's/Tobi's attack, Obito was/would have been only 14? I'm pretty sure Tobi looked a lot older than 14 there.