Wow, we are getting far into the manga. The past few chapters have been revealing and let's round up a couple of things that are happening until now.
First off Obito is Tobi.
What triggered this is rin's death. Kakashi was unable to protect her and Obito somehow found out.
This means that Rin died within a year after Obito "died". So saying this happened that means Obito survived. Rin died. Madara trained Obito and Obito is at the level he is at right now.
Second off, do you guys see a pattern right now? 3 Main villains of the story had something to do with Konoha and now Kakashi has come full circle with Naruto and Jiraiya
Jiraiya -> Orochimaru
Naruto -> Sasuke
Kakashi -> Obito
For now that's all the facts I have. I'll edit my post in the coming days with more facts.
Hope you guys liked it!