well i guess because none of the volturi can see the future and knowing the future could be highly useful. Its the one thing nobody else knows in the twilight series.
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Obviously Irina gets killed. Here is where Alice's vision begins... Carlisle engages the fight trying to protect Alice but gets beheaded by Aro then set aflame. Jasper gets killed. Seth gets killed. Leah sacrifices herself for Esme. Jane gets killed by Alice. Alec gets killed by Emmett. Marcus gets killed by Vladimir and Stefan. Caius gets killed by the Denali Clan as vengeance for Irina. Edward and Bella kill Aro who almost kills Edward. I think that's about it.
of course not! (Correction) In fact, in a vision that Alice gives Aro, the Volturi leader, Seth Clearwater, Leah Clearwater, Carlisle Cullen, and Jasper Cullen all dies, but ONLY in the vision she gives him. Also in the same vision the WHOLE Volturi group is completely wiped out. Edward and Bella kills Aro. Just as they are lighting Aro on fire Alice ends the vision.
Joseph Aro is 5' 9 1/2".
So no one finds out where she and Jasper are going except for Bella because she is the only one who's thoughts cannot be read by Aro.
Their names are Johnathan and Sarah.