Board Thread:Episode Discussions/@comment-26005711-20150730124954/@comment-5936871-20150731190108

Alright, well that makes sense then I guess. He manifested cause Madara's body already had both Hagoromo's chakra (Asura and Indra's) and Kurama's cause he was the TTJ. He just chose to surface once Hashirama and the others arrived.