Il Dire, The Telling. The device of Rambaldi. Sark is the one who tipped off the location of Sloane, NOT Irina. But Irina apprently knew where Sloane and Il Dire was, in Mexico City. This is where she tells Sydney, "Get Sloane!" Perhaps to stop him from using the device. Sydney, instead, chases after her mom. Irina reveals to Sydney that she is the One in the Prophecy, that only she can stop Sloane. Irina said that Sloane thought that he was chosen to hear the word of Rambaldi. Perhaps this word reaches Sloane through Il Dire, The Telling? And how would Sydney stop Sloane from receiving this word? Part of the Il Dire was the De Regno heart, a machine, an artificial heart. Rambaldi was fascinated with immortality, trying to find a way to circumvent cell degeneration. The heart is what kept De Regno alive--he had no other "real" heart, and he was of old age. The heart sustained him. Sloane said that Jack would be helping him sooner than he thinks. Was Jack needed for the device? He is the father of the One. Maybe that is why Sloane kept him. Maybe he used him for something. Sydney has a brawl with Francie. Sydney, near death, wakes up. It is two years later. Sydney is alive. Will, too, is alive after being stabbed by Francie. SYDNEY: What happened to Will? To Francie? Are they dead? VAUGHN: Will's okay. SYDNEY: What? How? VAUGHN: You... Sit down. Vaughn seemed to have made a clue that Sydney saved him. How did Sydney save him? Maybe Sydney used Il Dire to save him. Maybe unintentionally, unconsciously. It could have been Irina that used the device on Sydney. The device does contain the De Regno heart, a sign of life. Maybe it also kept Sydney alive. Going back to Irina using the device, maybe that is why Sloane needed Jack--Sydney's blood (which contains Jack's and Irina's) needed to activate it. Why not use Irina? Sloane knew that she was going to betray him (there was a scene in which Sloane confronts Irina that was cut out, I believe). Irina knew more about the Sloane-Rambaldi relationship than Jack did. She must have known what Sloane wanted the device for--for his own good. Irina got the device from Sloane and used it on Sydney. Sydney, since Irina used the device on her, was the one who received The Telling, the word of Rambaldi, instead of Sloane. This explains her insight into the future (drawing from other theories). But Sydney is not aware of this, explaining her loss of memory. The two years part is unclear to me, still. Again, drawing from other theories, it may not actually be the future, but a Telling of the (possible) future.