[Haiprbim]

Originally Posted by Casshern

Spoiler:

Can someone remind me why Madara needs to be alive to become the 10-tails host when Tobi already had a bunch of ET hosts?

Answer is under the Spoiler tag.

Spoiler:

Because he is an Uchiha as well as he has the Senju cells, giving him the power of Rinnegan. With Rinnegan, he is able to control the Juubi (10-Tails), which other bodies are not. Hope I helped.