Let me help you out:
1. Orochimaru was able to know through his Senjutsu inside Anko that Madara is resurrected through Edo Tensei.
2. Orochimaru has a continued plan to take over Sasuke's body in order to reach the potential of Sage of the Six Paths.
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3. Madara and Obito are using the Juubi to control the world through Genjutsu.
4. This obviously conflicts with Orochimaru's goals.
5. Orochimaru is a master of Edo Tensei.
6. Finally, Orochimaru knows many forbidden techniques, so it follows that he has potential to put Madara out of business.
However, I will say something about your theory, its in this panel:
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So I don't know man. It is Kishimoto's Plot, but he is the master of surprise, so we can always have hope.