Is it possible that the Man In Black has been pretending to be Jacob all along? The rumor is certainly picking up steam, primarily in the actions of Ben who has always proclaimed that he has been doing good work while still carrying out evil acts (like killing Jacob or strangling Locke). Because of the Man In Black’s ability to shapeshift, it’s possible that he could have taken on many forms including Christian Shepard, Alex, and now possibly even Jacob.
Credit: E! Online