I am generally not a television viewer, but I enjoyed Breaking Bad and I've been enjoying Better Call Saul. I have a prediction: Jimmy's love interest, attorney Kim Wexler, is his sibling. Neither of them know.
Kim Wexler, we've been told several times, was put through school by lawfirm HHM. Law firms don't do that. Why would HHM put Kim Wexler through college and law school?
Because she's the undeclared, unaware love child of Chuck McGill, who uses HHM as a facility to tie up his loose ends.
Jimmy and Kim find happiness together. They consummated their relationship last week. They're going to develop a bit of depth together.
Maybe they're going to get engaged. Maybe Chuck finds out about their affair and says, Hey you can't do that. Somehow, Kim becomes aware of the reason for HHM's support and her lineage and then eewwwwww - the happiness between Jimmy and Kim has been incestuous.
Jimmy's happiness has once again been turned to ashes in his mouth by Chuck's machinations. This is what turns him from James McHill to Saul Goodman.
You heard it here first.