Who said Kelvin is dead? Cracked his head open...Desmond sees the blood and runs back to the hatch.. Did he check for a pulse? Sure he left the boat for Desmond to take 3 years later but maybe he's with the Others. He IS a spook yanno! And Desmond "lives" along with Echo and Loche! (unless they get grabbed for drunk driving in Hawaii over the summer in which case they're goners!)