Well... I have another theorie, a Rimbaldi mythology theorie:
Maybe there is an anciente device, some sort of criogenic container that had a baby inside... the son of Rimbaldy. The conteiner was carered for by Rimbaldi followers until the moment they knew that the chosen one had been born.
Then they brought the baby back to life and he was raised as a son by one of the followers of Rimbaldi: Bill Vahghn.
Bill Vaughn was chosen because he worked close to Sidney's parents because the two, Sidney and Michael, acording to an anciente profecy wore to fell in love and have a baby.
Laura seduced and married Michael although he was no longer with CIA, because she wanted to have a son of him, thinking that her baby could be the one , but Vaugh only can have children with Sidney... the stolen eggs of Sidney could be for Laura...
Vaughn would have been created in this misticas beliefs by his adoptive father since he was a baby... but Bill Vaughn died too early.
Vaughn's adoptive mother did not aproved of her husband's teachings and made all she could to make Michael forgett... and he did... he bloked every thing out of his mind... he does not know who he his...
But the search for its father (in the last season)was the catalyst that made him remember everything. The mother of Sidney must have belonged to this group of followers of Rimbaldi, or as a KGB agent was infiltrated between them, she must have known Vaughn as a child (mayby as a baby and he is the baby on the picture), already as a child Michael took part in their activities (was bad as kid).
Sidney's mother must have realise that something was wrong and that Micheal was remembering her from the past.
And she told Michael to tell Sidney about it because later on Sidney could think that he maried her out of interess, not because he loved her, but because he wanted to make the profecy come true.
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