I have a theory of what Madara's trump card could be and what can it do, so read and enjoy=D.
Since chapter 638 when Obito became the Juubi Jinchuriki, it has been confirmed that Madara still had a trump card that would lead to Obito's downfall and it seems Obito is aware and at least knows what that trump card could be.
I think Madara's trump card is ''Will Materialisation''.
Will Materialisation:
So basically Madara creates any sort of creature and infuse his Will to it so that creature can perform Madara's orders as he did to Black Zetsu.
It also has been confirmed that the Black Rods (Chakra Receiver) has Madara's will inside of it allowing Madara to control people with his will as seen by Obito:
Also it appears that Madara had implanted these Black Rod inside Obito's body:
So Madara's trump card revolves around him transmitting his consciousness through these black rod that contain his will and allowing him to take over Obito's body thus stealing the Juubi.
Now we have seen Nagato who implanted the Black Rod in the 6 pain bodies and by doing that, he controlled them like his own body through his chakra that was being transmitted to the bodies:
Madara's trump card would most likely be the same way with Madara sealing all of his mind and powers into Obito's body because it appears Madara's black rod are more unique than Nagato's black rod.
This also explains why he said Obito might notice Madara's trump card since Madara actually taught him the Yin-Yang techniques and the Rikodou No Jutsu which all revolve around Madara's abilities to manipulate people with his Will as he did to Obito.
I think to use his trump card will most likely take time because he seems to be worried in chapter 645, and he must act quickly.
I hope you have enjoyed my theory:O
Thank You...Madara Rules
Since chapter 638 when Obito became the Juubi Jinchuriki, it has been confirmed that Madara still had a trump card that would lead to Obito's downfall and it seems Obito is aware and at least knows what that trump card could be.
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I think Madara's trump card is ''Will Materialisation''.
Will Materialisation:
This is an ability possessed by Madara Uchiha, allowing him to manifest and infuse his will, as he did to create Black Zetsu by pouring it into White Zetsu, describing the sentient creation as a weaker version of himself. This ability can be channelled through objects as well. As shown with the chakra receivers, Madara was not only able to remotely manipulate the actions of his targets, but also telekinetically manipulate the rods, by imbuing his will into them.
So basically Madara creates any sort of creature and infuse his Will to it so that creature can perform Madara's orders as he did to Black Zetsu.
You must be registered for see images
It also has been confirmed that the Black Rods (Chakra Receiver) has Madara's will inside of it allowing Madara to control people with his will as seen by Obito:
You must be registered for see images
Also it appears that Madara had implanted these Black Rod inside Obito's body:
You must be registered for see images
So Madara's trump card revolves around him transmitting his consciousness through these black rod that contain his will and allowing him to take over Obito's body thus stealing the Juubi.
Now we have seen Nagato who implanted the Black Rod in the 6 pain bodies and by doing that, he controlled them like his own body through his chakra that was being transmitted to the bodies:
You must be registered for see images
Madara's trump card would most likely be the same way with Madara sealing all of his mind and powers into Obito's body because it appears Madara's black rod are more unique than Nagato's black rod.
This also explains why he said Obito might notice Madara's trump card since Madara actually taught him the Yin-Yang techniques and the Rikodou No Jutsu which all revolve around Madara's abilities to manipulate people with his Will as he did to Obito.
I think to use his trump card will most likely take time because he seems to be worried in chapter 645, and he must act quickly.
I hope you have enjoyed my theory:O
Thank You...Madara Rules