Who is the Destroyer?

As I am reading the novel I begin to wonder who is this destroyer that has been stripping the world of all its successful men who are capable of making the world a better place. Is it a bad thing that all of these men have been disappearing? They are leaving the world lacking responsible men who can balance all the so called looters and corrupt politicians. Conversely, I have also thought that maybe this is a good  thing because in many situations, it is necessary to hit the bottom before  beginning to make things better.

Back to the destroyer, I wonder if he/she is tied to John Galt of if he/she is John Galt. I highly doubt this because I have a feeling the John Galt is something of much more importance that will surface late in the novel in the form of a plot twister. Lately I have sensed some foreshadowing that the philosopher Dr. Akston is or is tied to the destroyer. Mainly because of the cigarette butt left in Ken Danagger’s office which is similar to the one that he gave Dangy in Montana earlier in the book. This clue leads me to believe that even if Dr. Akston isn’t the destroyer he must be in some way connected to him. Lastly, I would like to predict that Dagny is going to find the destroyer before he finds her. Moreover I want to predict that she is going to find him as a result of the cigarette butt and the old man in the Taggart Terminal.