There are a lot unasnwered question actually. For me these r:
1. After Nagato died, Obito mentioned that he needs time to sync Sasuke with Gedo-mazo. Why? What that sync means? Remember Nagato, Gedo-mazo stick some bars on his body and for what reason? Obito can revieve Gedo-mazo without those bars...
2.As we talked before; is Obito using Kabuto or what happened until now was just a coincidence?
3.How did Kabuto revieve Madara and where did he get his dna?
What i really expect Obito will turn against Madara but he wont change his mind about the plan, probably he will take control of Madara, somehow or stop him for a reason but Obito will become a bigger threat to all shinobi world even more then Madara...