With both MS? I assume you mean MS in both eyes.And what proof do you have that this is invalid?Of course, you have none.My theory is base on everything we have read in the manga, your thoughts are base solely on your own opinion.
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What stupidity.Knowing Madara had MS and knowing the abilities he wield is two different things.Itachi also believed Obito was Madara, so I guess Obito is Madara and not Obito because Itachi believed it.And how stupid is it to bring up Itachi knowing of Shisui's MS when we all know Shisui was like Itachi's Sensei.
Tobirama knowing of the technique doesn't mean he knows it because of Izuna.Both Madara and Izuna fought in battle against The Senju Clan.Either of them or both could have used Amaterasu in battle and Tobirama would have known because they were fighting in the same vicinity.