i thought the virus was a cover for Ben gassing everyone...they told dharma that they were killed by this "virus"? maybe im wrong...i think jack is whacked out onj morphine/valium etc cos of feeling guilty...maybe the island was "invaded" after they left and he ruined there way oflife OR maybe they were saved people gotkilled all went t!ts up and Jack is feeling guilty....Kate is a little more hard skinned i think thats why she was so fresh faced....or carzy idea...the Flash forwards are desmonds visions and may not happen...his vision of a defreckled Kate? who the hell knows...