I'm more of a reader than a poster, so bare with me if this has been mentioned before. I'm in the process of re-watching season 2 and in Man of Science, Man of Faith I got the distinct impression that things are not as they seem (as usual). When Jack is talking to Sarah when she comes out of surgery it is clear that he thinks there is no possibility that he has fixed her. He is completely shocked when she can move her legs. I'm no spinal surgeon, but a crushed spinal column doesn't sound fixable. We meet Desmond in the stadium right before this and he seems to be telling Jack that he should have more faith. Is this Jacob's way of boosting Jack's confidence? He heals Sarah, which allows Jack to have more faith in himself or in miracles? Jacob did say that sometimes we just need "a little push", so I'm wondering how much pushing Jacob has been doing in the Losties lives prior to the crash.
P.S. - This site is much better that the last one. Thanks Anne!