I would love to see that convo too, actually. I kinda fear how the TPTB would handle it. Given past history and how they treated their working relationship from the start, I'd hate for it to turn into a Nesting Dolls type shouting match. They've written Sara to be very stubborn about this relationship with Gil, whether she believes it to be a good move or not. Either way, I think the writers owe the characters some kind of closure. Sara and Cath have come a long way since the second episode. It would seem weird for neither woman to address it.