It wouldn't have been possible here though. You wouldn't know the codes they used to communicate.
These elusive targets are supposed to be as close as possible to the assassin fantasy. This means they are more realistic when regular missions are more like a puzzle where you can see all the pieces from the start.
It's mind boggling to me that people get legitimately mad at IO for this one. Who gives a rat's ass if you fail an elusive target seriously? The whole point of them is to up the stakes. So that means you'll go in the dark and fail more often. You put yourself in 47's shoes. Why would you subdue the courier before you have any understanding of the situation? Would a trained hitman really do that? Of course not. You only do this because you're used to have your hand held and be able to restart if any shit goes wrong. Well if your feeling are hurt that easily, stop playing them.
I hope IO keep taking risks with these ET. Especially nowadays when most devs are scared shitless of alienating their fanbase and keep using the same recipe until everyone's sick of it (see CoD, AC, etc.) I personally can't wait to fail my first ET. It'll be a great story.