User blog comment:Assassin for the argonauts/ACIVBF - What's the point?/@comment-5180558-20130529091648/@comment-6517-20130529123304

"Abstergo used William's as a hail Mary pass when they didn't have Desmond. Now they have Desmond"

Yes, but Desmond is dead. Just pulling the DNA from a corpse isn't enough, you need a living receptor to act as a conduit for the memories to be viewed.

Abstergo may have Desmond's body, but it is effectively useless to them as it stands.