Significance to Vincent at "the End"

Jack's "Live Together Die Alone" speech was a theme throughout the seasons of Lost. After all Jack had done to get back to the island (with everyone), and after going through such tests of faith like feeling responsible for the deaths of many, all so that he could sacrifice himself on behalf of others- quite simply put, Jack Shepard did not deserve to die alone, and maybe seeing Vincent in his dying moments, let him know, or foreshadowed that he would never have to be alone again.

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