I'm really looking forward to that too. I wonder how she'll react. Nothing wrong with not feeling anything for Isa, I like her, as you know but not as much as Alex. I actually forgot she's leaving and I've no idea why she is.
I turned down her offer, if just didn't feel right since I was already on Alex's path (in my head at least), and haven't given Val a proper chance yet so can't really comment. Both Isa and Val resemble our fiance, and while I didn't react like that at all at Val's comments or offer, I can see how someone would. I didn't want to complicate things with Alex or hurt anyone if I had to choose, it felt like the wrong thing to do morally. Since Val was not intended as a main LI at first, BTT had to work with what he had already put into the story and their backgrounds, which I assume puts some restrictions on how he could develop her further once she'd 'leveled up'.