Quote Originally Posted by paulbee View Post
As I understood the chapter, Madara did not regrow the Geddou. What happened is that Obito is the Jinchuuriki of the Geddou Mazou (the now empty husk of the Juubi). Madara simply Summoned the Geddou, thereby separating the Geddou from Obito. This is why Black Zetsu was able to declare that it was his presence merged to Obito that was keeping Obito alive.
See this in a sense is a plot hole, unless some explanation is given.

When Madara tried to summon the Kyuubi from within Naruto, he failed because the Kyuubi was sealed within Naruto. Now he can summon the gedo Mazou despite it being sealed within Obito? This does not add up