LOST -"He's Our You"?

LOST -"He's Our You"The DHARMA Initiative struggles to discover the identity of Sayid Jarrah, while Sawyer tries to make sure that his secret remains safe.Is young Ben Linus actually dead?Who was responsible for the flaming Dharma bus? Do you think it was Ben?How does Ilana know Sayid was responsible for the death of Peter Avellino? Did Ben tell her?What kind of authority does she have to take Sayid into the plane with handcuffs? I know she posed as an air marshal, when she passed through security at LAX. But, is she really an air marshal or just a bounty hunter?