Re: Earth will fall [SPOILERS]
I still think it makes sense that Harrison is actually one of the other Augments who just took Khan as a title. Meaning: In this timeline, the real Khan was one of the ones who died before he could be revived, and Harrison took over as leader (thus the title 'Khan').
"Pitching is simple -- cheese for the kitchen and a yakker for the kudo." - Dennis Eckersley