Who's name was crossed out in the cave?? When Locke was in the cave showing Sawyer the names in the ceiling of the cave, he crossed out a name? Was it Kate's? I don't remember . . .
MiB in Locke's body crossed out Locke's name. As for Kate's name in the cave, there was no screen cap or anything that actually showed her name clearly, so it's hard to argue the point that her name wasn't there, when we were just told by Sawyer that her name was there, and crossed out.
I think that Kate is off the cantidate list because her intentions are to get Claire, take her off the island to her baby. I think the big thing about being the cantidate is that you have to be willing to stay on the island, for the island's sake, which is why I'm 99.999999999999% positive that Jack is going to be the new Jacob.