What episodes of Lost have conflicts of leadership?

Not without doing a lot of reading. I think probably most of the episodes after the first 2-3 have some conflicts. There was Jack/Locke, Jack/his father, Jack/Sawyer, Sawyer/Locke, Michael/everyone else, Jin/Sun, Sawyer/everyone else, Ben/Jack, Ben/Locke, Ben/everyone else. You might try, Lostpedia, though, since I think it addresses issues in more detail.