Not sure if this has been discussed, but suppose the guitar Jacob gave to Hurley acts in the same manner as Richard's/Locke's compass. When Hurley is flashed forward 30 years at the end of Season 5*, the guitar flies through time and lands where Charlie finds it via John Locke in Season 1. When Charlie dies/815ers scatter due to Kahana, his guitar is taken by Jacob and delivered to Hurley at the prison to only go back in time again, pushing Charlie and Hurley to get back on their intended paths at their respective points in time...the guitar being a physical catalyst for course correction...

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