So what was Desmond's purpose in the FST?

O2Cool May 24, 2010 User blog:O2Cool

So i realize that Desmond was brought to the island because he could withstand the EM and was needed for that purpose. But if the FST was really all the dead losties finding there way then what reason did Desmond serve in it? How was he aware of both timelines? Was he some sort of angel collecting their souls? Any thoughts?

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