remember the first time locke sees the smoke monster, although we dont see it, we assume it is from the noise and the height of the 'smokes eye view 'when its above him. Anyway i believe what he saw is jacob, not the smoke monster, because he wasnt scared, what he saw was 'beautiful', and therfore mybe jacob is a white smokey, good as opposed to the the black nemesis one. This is why locke is so important he has seen jacob in his original form and bonds with the island, furthermore the second time he hears the smoke monster he runs towards it, but seeing it is nemesis, he is terrified as it grabs his legs, it let him go because he had been 'touched' by jacob.

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