Jacob was in the taxi with Hurley the day before Hurley got on Flight 316. Hurley said to Jacob that if he was seeing Jacob "he must be dead." Jacob said, "I am most certainly not dead." That day was in 2008. Jacob is stabbed by Ben in 2007.
Do you think that Jacob is most certainly not dead because:
1) he survived the stabbing; or
2) the 1977 bomb did change what happened; or
3) Jacob is immortal