Hmm, those are all pretty fair points and really, it could very well go like that even if it hadn’t been originally planned, considering who audience feedback. But, we know how reluctant TPTB are to listen to feedback they consider as niche as this, and I also don’t know if they’re really willing to just have no young good-looking guys in a full season. Or good guys in general, since obviously Vincent can’t be trusted.
Plus, the voice over stopped because they just realized they didn’t need it as a narrative device, according to Simon Barry, so it didn’t really have any deeper meaning than that. I can see it both ways, really, that some writer will be like, it’d be weird to not bring back a character so integral to Ava’s effective reintroduction to the world while other writers will agree that his purpose has been fulfilled.