I think smart money has always been on this interpretation of the "Valonqar" prophecy.
I can't say that Felix isn't a host. It certainly would make sense, now that we know about Maeve's "escape" narrative. As to Maeve following the script on going after her daughter, though, that is a theory to which Nolan and Lisa Joy have explicitly put paid:
In vampire/paranormal novels, this is usually handled by the person "going away" for a while, and then returning as a relative. Of course, this probably worked much better in previous years than it would now, and I certainly don't see it as an option in Westworld, short of some extreme tampering on the part of Ford.
Yes. And some great acting from Evan Rachel Wood throughout. Amazing how she can communicate the sense that Dolores is flat-out lying...without at all giving that away in the scene to Ford, or her other interlocutors.