Is it just me or does the Jacob that we see in Season 3 look a lot like Frank Lapidus? Becuase after Season 5 I am starting to think that after Jacob is killed by Ben Jacob will take over Frank's body. After all Bram and Co. said he was a candidate for something...... Also it was Jacob who asked the others to construct the runway in Season 3. Presumably so that Ajira Flight 316 could safely land with Frank as the pilot so that Jacob could then take over Franks body after Ben kills him.
Am I on to something?