This theory seems correct, but it is plain fabrication. Facts is that the Madara fans do not have the ability to consider the manga as a whole. They always cling to partial facts, and build pretty arguments based of these partial facts.
First, while your evidences are similar, nothing prove that they mean the same thing. In fact, you are still ignoring that Hashirama is a earth style user, and his clone are as concrete as the real one. Whether Madara used Genjutsu or not, the final clash showed at least based on the 626 that everything he did was done on a clone.
Second, there is an evidence that Madara's wound was real. This panel is extracted from the chapter "the Dream world" when Madara explained how he obtained the Rinnegan:
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Clearly, Madara is pointing where Hashirama stabbed him. Your genjutsu argument, the disappearing of the sword, everything is wrong. Madara was fighting with Hashirama's clone. The sword is not there because either of the angle, or because Hashirama took it back. After all, defeating Madara does not mean he has to leave his sword on the battlefield.
The worst is that you think Hashirama's question about how Madara was revive is a clue. In all logic, this only mean that Hashirama was certain that he killed him, and it also mean he did not know that his cell could be used by someone else.
Worst, you are forgetting that Hashirama's cell can repair damage part of the body. Check Obito for example. Even partly crushed, Hashirama's cell gave him life again.