I think that's the way it was in the books Courtney was a normal kid until she had to be Alison, which led her to be just as nasty as Alison was - she lost herself when she put on the act (to my understanding, anyway). It makes those "dreams" interesting, imo. It makes sense if she isn't the girl they were friends with, because aside from diaries etc. she didn't know these girls - maybe she waited until they were impaired to approach them and find out more about them.

I didn't notice that she hadn't said anything, but that is interesting. I heard that the network said that only Troian and Ashley knew, but if Sasha knows and it's her, they probably wouldn't want us to know that she knows

Spencer's family are one of my favourite things about the show, so anything that leads to less of them will suck for me. I really want to see the Spencer/Melissa relationship develop now that the truth is out (at least within the family/liars).

I still suspect that the master -A is gonna be someone around from the beginning, not some random late entry character. Wren can be tied to a lot of stuff, what he has always lacked was a clear motive. I don't think it would be hard to give him one though. In the end he may not be the grand baddie but they HAVE to tie him into some conspiracy somewhere, he's too good a candidate and too shady not to be involved in something !