On some Olivia/Kane topics above...
What makes Olivia/Kane so great (Dom Olivia / Sub Kane in particular), is how weighted it feels. It isn't Juliette mindlessly brutalizing no-name stands in. It's two people with history on a journey of discovery, and how each reacts to each other, and themselves, is the most compelling part. Olivia slowly giving in to her dominant tendencies is a fantastic watch alone, but having Kane as a foil/victim makes it so much better, because he's waiting for that empathy that's quickly vanishing.
I do believe in the theory that they aren't blood related (it's made real easy to buy, because they look nothing alike too), which will make for a magnificent potential twist later. Furthermore, I do hope the interactions between those two continue and expand, especially in the Dom O / Sub K tree.