Well, if Madara were revived through Rinne Tensei, wouldn't he be super old?
My theory is, that's the reason why the timing was so crucial. I'd wager he originally had to be revived on the moment where the moon's eye plan would be complete. The moment when the frailty of his physical body wouldn't matter anymore. Or perhaps, there would be a new body waiting for him to be revived in: The body of the Ten-Tails.
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