Minato, Kakashi and Rin decided to kick Obito out of the team because he slow the team down. Heart broken by the team's decision, Obito decide to train himself harder than before but unknowingly unlock his true potential as the Tailed Beasts began to sense the beginning of their guardians and with Obito unlock the 10 Blades of Five elements- Full summary inside! Obito-centeric!

"You will learn how to destroy worlds and make them anew, and be god, creator, overlord. You will become me, I will live in you, until we finally watch the first dawn alight our new world." [Madara and Obito spend a long, long time in that world of genjutsu. Chapter 606, expanded.]