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Once more, Madara already has canonical knowledge of the weapons along with their function and would know to stay away. Itachi will pose no threat if at a distance and the bold is merely a hypothetical conjecture in your favor. Maybe you forget that Edo-Madara possesses Mokuton and The Rin'negan, which provides him with
various alternatives of finishing Edo itachi as he can simply put him to sleep with Flower Tree world (something itachi has no canonical knowledge of) and finish him off with Ningendō's
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, or, Summon the Gedō Mazō and allow it to seal itachi with it's Soul dragon's as wielding the Rin'negan allows the user access to all it's abilities. Itachi stand no chance against Madara whether both Edo's, or Both alive as he is always inferior.