(The video is indeed a curious find. though from Jan-Feb 2009, this doesn't detract from its relevance. The Rebbe passed June 12 1994.)
Mashiach will definitely return. However, it seems there is certain disagreement within the Jewish world as to which one it will be.Indeed, which one it will be, and also whether it will be, why it will be, how it will be, etc. etc. etc.