What is Desmond's purpose?

What do people think Desmond's purpose is on the Island?

Will he at some point trap MIB in one of the pockets on the island since he is the only one who can withstand such strong electromagnetic energy? Will it be something else? And does he already know what he's supposed to do or was he just telling Widmore that he is now fine with being on the Island and he will do whatever Widmore wants?

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