I was thinking about the destroyed seals above the Jyuubi. Perhaps they represent the entities that made a contract with the jyuubi. If that is the case then Madara and Obito would have a seal and they also were partners. Maybe their seal got destroyed because they had a change of heart before they died. It would be cool if they came back to save the shinobi world. 10 Obito had a similar power as delta and kawaki except he could manipulate truth seeker orbs rather than his body. It makes me wonder if Kawaki's body is created from jyuubi cells.