Good Point Lizard! Was Locke repentant? He had seen the smoke monster, but he saw it as a bright light, not the dark cloud that Eko saw. Who else has seen smokey in smoke form... Locke (while hanging halfway down that hatch thing) asked Jack if he had seen it and Jack answered yes... but Jack has yet to be confronted by the Smoke monster. Maybe there is something to being a penitent soul vs. an unrepentant.

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`Dear, dear! How queer everything is to-day! And yesterday things went on just as usual. I wonder if I've been changed in the night? Let me think: was I the same when I got up this morning? I almost think I can remember feeling a little different. But if I'm not the same, the next question is, Who in the world am I? Ah, that's the great puzzle!'

-- Alice, from “Alice’s Adventure’s in Wonderland”