This time is very weird though, Nathan has shown zero interest in Maxie since he returned. You'd think he would have been extremely worried about her when finding out she was in a coma, but his behavior seemed very detached and when Maxie chose Spinelli he seemed relieved more than anything. All of this feels like its fallen very flat and seems forced. Lulu and Nathan like they've been pining for each other for months. I still don't think this is Nathan or if it is, his brain has been altered somehow.
All this is why I'm convinced he's not the real Nathan. Perhaps Nathan had a twin? Something is up. I suspect that Maxie will be the first to pick up on it and accuse him of being a fraud. No one will believe her, tho, because they will think she is just angry and lashing out at Nathan because of Lulu.
All had it out for Luke... having "Nathan" seduce his daughter for some dastardly reason is a very old school Faison/Helena sort of thing to do... but to what end?