While Edwin is acting like an asshole to an actual 16yo who was just possessed by a demon, lost her memories and had nowhere to go, Charles was a dick to Edwin there.
He knows that Edwin doesn't like change, he knows he's not good with people, but he still decided, on his own and without Edwin's consent, to allow Crystal to stay with them. Charles is not the only one leading the agency, they both are and this kind of decisions should ABSOLUTELY be discussed before. Especially when one is clearly against even before this choice was formulated.
It's not like there weren't any other options for Crystal : they could have gone to the police and say she lost her memories (they probably know her already btw, thanks to her previous angelic behaviors), they could have asked other psychics (they're all probably adult given how Charles talked abt them)...
Many options except the one who will unnerved Edwin the most (and there probably many of us who would have the same reaction as him), but Charles is so excited that he tunnel-vision on Crystal and basically ignores Edwin's feelings (that he knows came partially from his traumas from Hell)
I will go as far as saying that Edwin and Crystal began this bad bc of Charles. Yes, Crystal - with her powers (she can do things he can't no matter his amount of knowledge or his time of pratice) and personnality - is a menace for Edwin's way of thing and self-esteem. But the biggest issue came from Charles behavior. Charles who's so clearly crushing on Crystal, Charles who's always taking her side, Charles who ignores Edwin's feelings and traumas and forces things on him he clearly doesn't want. Charles who talked about his more private feelings to a stranger but never to Edwin.
Charles has his own traumas and we can't expect him to cater to everyone and to always have the perfect reactions. But when you see Edwin's reaction to Niko, it's the day and night. Yes, Niko has a more calm attitude (the first thing she did wasn't to insult the name the boys are so fond of) and doesn't have powers that make her a competition to Edwin. But he accepted her almost immediately, he's never bitchy to her, he supports her and her traumas, they spends time together...
I'm honestly surprised Crystal is not a bit bitter at Edwin for the different treatment of her and Niko.
In conclusion, imperfect teenagers acting like imperfect teenagers
