Well, you're probably right but so far we've seen Jack all messed up on drugs. Hurley in a mental institution. Kate is free, has a nice house and cares for a little baby, this to me already tells me she's more stable than Jack & Hurley. Of course this is Lost and she will face challenges but as long as Sawyer is not one of the Oceanic 6, Kate will than be a much less confusing character.. lol