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If I’m on the right track here, based on Chapter 18, Isaac is Noah’s other personality (and they are aware of each other). Which means the feelings that Finn gets sometimes about Isaac being similar to Noah are correct, but she doubts it because her “uncle” only sees Isaac. As far as I know, he didn’t know Noah other than when there was that incident of him murdering Finn’s scumbag father. So the uncle wouldn't know all of the nuances and expressions that Noah would have made in Finn’s presence that now makes her question Isaac’s behavior.
But it could very well be the opposite at the same time. Maybe Noah is Isaac’s other personality! In which case, that would be an even more interesting twist.
I guess I just have to wait to find out. ٩(๑❛ᴗ❛๑)۶