*Yet he caused his Sensei to use a Suicide Technique.
**Kakashi became Jounin at like 13. Ninjas in the past were more skilled than Ninja were right now. His teacher was the 4th Hokage. He could have managed to learn that technique somehow. And he has the Sharingan too sooo... He could have gotten help somehow, but this remains unknown.
***Kabuto manipulated Obito into working with him without Sharingan. And plus, the Mizukage was young, so it was probably easy to do it... -_-
****Omfg. You guys say this so much. Nagato awakened his own powers. He was born with it, and awakened it himself. Madara could never have laid a finger on Nagato. You believe everything the Manga says like it doesn't have Plot holes.
*****Yahiko started it on his own. Obito knows how to Manipulate people. And the Orphans are Gullible. Obito slowly took over, and started working with Nagato, so they can both reach their goals. Nagato had his own plans, and so did Obito. When the time came one of them would turn on the other, and all Hell would break loose. Nagato sacrificed himself for a good cause and died. THAT's when Obito took Nagato's eyes, and started thinking he was a boss saying, "Those were my eyes to begin with." because he was planning to take his eyes from the start.
******Yeah... Right... Like nobody in Anime ever turns evil...