Jacob and his nemesis, let's call him Samuel, are the only true islanders and might be brothers. Born on the island with great godlike powers and the ability to never age. The two have different opinions about how to use their existence, Jacob believes in using his powers to help people by bringing them to the island to worship him and receive gifts like healing in return. Samuel on the other hand does not want to share the island with people that he thinks only bring destruction, he thinks it's meant for the original inhabitants. These two men is the two sides of the island, good and evil if you will. Something that was symbolized by the white and black stones back in season 1. Jacob lives in the statue of the Egyptian god Sobek, which had the ability to undo evils and cure ills just like Jacob. Samuel might have been the one behind destroying the statue because he didn't want it to do what Jacob wanted it to do! , lead people to the island.
Samuel hates Jacob for bringing people to their island and wants him dead so it will stop but he can't kill him himself. Samuel is probably controlling the smoke monster, or it's himself in another form. Samuel realized that he had to manipulate Jacob's followers into killing him and it had to be someone of power among them. Ben and even more so Locke was the tools he chose to use by manipulating them with one of his powers, the ability to take the form of dead bodies on the island. He manipulated Locke by taking the form of Christian Shepard and Ben by taking the form of Alex and Locke. After a long time of scheming he finally succeeded in killing Jacob.
Season 6 will probably be about the long awaited war between Jacob and Samuel. Jacob's followers lead by Illana and Bram arrived to let Richard and the other follower of Jacob on the island know about what Samuel was up to. Jacob will probably be reincarnated as someone else, Frank was a candidate for that according to Illana. Samuel, reincarnated as Locke, and Jacob, reincarnated as Frank for an example, will use their powers and followers to determine once and for all what the true purpose of the island is.
Samuel hates Jacob for bringing people to their island and wants him dead so it will stop but he can't kill him himself. Samuel is probably controlling the smoke monster, or it's himself in another form. Samuel realized that he had to manipulate Jacob's followers into killing him and it had to be someone of power among them. Ben and even more so Locke was the tools he chose to use by manipulating them with one of his powers, the ability to take the form of dead bodies on the island. He manipulated Locke by taking the form of Christian Shepard and Ben by taking the form of Alex and Locke. After a long time of scheming he finally succeeded in killing Jacob.
Season 6 will probably be about the long awaited war between Jacob and Samuel. Jacob's followers lead by Illana and Bram arrived to let Richard and the other follower of Jacob on the island know about what Samuel was up to. Jacob will probably be reincarnated as someone else, Frank was a candidate for that according to Illana. Samuel, reincarnated as Locke, and Jacob, reincarnated as Frank for an example, will use their powers and followers to determine once and for all what the true purpose of the island is.