Why didn't Obito die after using Rinne rebirth? In the Episode 391 of Shippuden, Reanimated Madara gets his own real body by forcing Obito via Black Zetsu to use the Rinne Rebirth Jutsu.

Similar to Nagato at the end of Pain arc fight, Why didn't Obito die since he used the same Jutsu as Nagato.

The wiki clearly states in exchange of own life, the Jutsu is performed.

Can anyone explain this?
In Chapter 657, right after Madara is brought back to life using the Rinne Rebirth jutsu, the scene moves to the Kamui dimension, where Zetsu confronts Kakashi, Minato, and a fatigued Obito. 

Zetsu explicitly stated that Obito will die from using the jutsu. And then,


  


So Black Zetsu was the reason Obito was able to postpone his unavoidable death.