The whispers that Rousseau associated with the Others in "Solitary" and that were frequently heard before key scenes thereafter are actually our post-Jughead losties. The combination of the nuclear blast and the energy at the Swan site blew them into a parallel dimension where they can see what is happening and can even be heard (in whispers) but are invisible to people remaining in this dimension. Thus Season 6 will be about the losties in the "nearby" dimension "re-living" the events of Seasons 1 through 5, as they catch up with the 2007 storyline, commenting on them, but unable to be seen by themselves or the other survivors, etc. until they finally encounter the "resurrected Jacob," who will have the power to "save us all" by bringing everyone back into the same dimension. If this theory is true, much of Season 6 will be like the scene in The Little Prince where Sawyer witnessed Kate helping Claire give birth! to Aaron, that is, we will see familiar scenes from a new perspective.
