User blog comment:Kaloneous/Mass Effect 3 Ending DLC Denied and PAX/@comment-4043223-20120404221754

So the oily shadow's whispers during the dream sequence has been confirmed. Here are two links.
 * YouTube video,
 * Transcript.

It doesn't prove the indoctrination theory like some people originally thought and only show the buiding guilt that consumes Shepard throughout the story.