User blog:Gearslover01/Why did we search through Altair in ACI (Spoiler for Revelations)

For those of you who got the DLC in which you played Subject 16's memories, it's revealed of Lucy's true nature. During this, Abstergo was exploring the 16th century Italy in the memories of Clay, and their target was later Desmond because he was related to Ezio Auidtore. Then why all of a sudden did Warren spend and risk time and Desmond searching in the memories of Altair? I know his memories contained a map of the Pieces of Eden, but why a sudden change of target if Ezio is their main goal.