I do think we are getting to a more clear answer as to what attracts Kim to Jimmy, and it isn't just what Jimmy is, but rather what he is not. Jimmy is many things, but he most definitely is not a figure of power and authority, and those qualities repulse Kim. Which leads me to try, unsuccessfully, to recall what we know of Kim's father, other than that he wasn't around. Which leads me to speculate that perhaps Kim is the progeny of a relationship in there was a huge imbalance of power, perhaps not as hideous as rape, but one in which Kim's father could psychologically compel her mother into a sexually exploitive relationship which produced Kim, and Kim at some point became aware of this. That certainly might result in Kim having a searing hatred of any man in a position of authority who seeks to control her (and we know how control issues are central to character psychology in the BCS/BB universe), and just as importantly, a bottomless contempt for the idea of her, or any woman, succumbing to a man's attempt to exert control. Jimmy's only chance to influence Kim's behavior comes by an absence of any overt effort to do so. Now, that's a lot to unpack for a major character in a final season, and that abrupt shift in our understanding of Kim is quite jarring, but I'm willing to see where the writers go with it.