I wasn't arguing that Madara didn't manipulate Obito?
http://www.onemanga.me/naruto_manga/614/9/That is Obito saying that Madara needs to be alive to host the Juubi, not to use Samsara. It wouldn't make sense in that context. "In order for you to revive yourself you need to be alive so you can use Samsara on yourself and become the Juubi?" he's saying "In order for you to come back to life and become the Juubi jinchuriki you need me to use Samsara."
On the wiki it only says that the jutsu takes a massive amount of chakra to use, and Nagato died because he ran out. Well Obito has been fighting in this war for a long time now, so he could know that he is at the point where his chakra is low enough that Samsara will kill him if he uses it.
That didn't prove you right at all, that was an explanation on what happened in the manga assuming you are correct. There was nothing there proving or disproving this either way, I still say you just can't use it on yourself.
Edit: It actually wouldn't make sense at all unless Obito was talking about being alive to host the Juubi because then Madara wouldn't need to be revived at all, he could just host the Juubi in his Edo body.