I feel that Locke knows he's special, just as Ben thinks he is. With recent events perhaps Locke is trying to work out if Ben is as special as he says he is, or if he is leading the others to believe he's more than he is.
After Locke's conversation with Richard, when he told him about Sawyers file and Ben going off on the fertility route, when there is more to do, I feel that Locke now has more faith in himself, or perhaps less in Ben, I'm not too sure. Either way his questioning of Ben could be as a test to Ben, rather than for an answer for his own benefit.
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