Originally Posted by Encon Uchiha
Madars never stated HOW Obito got to his base. I think in one panel one of the Zetsu's said they were the ones that got him there but vaguely. I would find you the panel but i gtg to campus.
Actually, Madara said Obito just appeared on his lair and said nothing about the Zetsu getting Obito. Reread the first chapter of the flashback.