I hope you are not posting his stats as a sign of good work of good work.
Casey has played 15 games. He has 15 points and is also a +2. Casey takes care of business in both ends. He takes the puck on his own in the O-zone and looks to set someone up and or shoots the puck almost always on goal. However, when he goes deep he also seems to get back defensively not causing Misyul (his usual partner to have to take on the rush without him. This is not a consistent description of Nemec when he goes on the offense. He is much more apt to go rogue.
Casey is also working very hard at taking on net front hangers with physicality in spite of his size differential. Nemec does not try to be physical. In fact he is more oftten on the end of physicality.
Casey wins a lot of board battles or at least holds on until he gets help. He is masterful at avoiding the fore check when he has the puck and getting passes up the ice in those situations. Often he ends up coming away from the checker and skating the puck into open space and either headmans it from there or actually leads the rush until he has a mate in a better position whom he passes it to or carries it in and may go all the way to the goal line always looking to pass or dumps it deep if he doesn't have space to penetrate the zone and doesn't have pen help. He doesn't try to force passes. He has been playing a safe offensive game since he got here.
Last season when he got sent down for a bit, he acted bitch slapped. It was like he felt he didn't belong here. That attitude came with him again. However, I don't think it has lasted, but his work ethic could still be better. He is not the best guy on the ice, but often attempts things that only the best guy could actually pull off. He will make dumb passes that sitting in the stands I know he is going to attempt and silently beg him not to do. That leads to turnovers and often serious goal chances for the opponent. He causes his keeper to come up big when it never had to happen. Like I said, Casey plays it safe in nhis end. His goal is to get the puck going the other way, like a good D-man does.
I really hope Fitz holds onto this kid. His attitude is nothing but positive about being here. He has stated he knows NJ has a very good D. He needs to do everything he can to improve every aspect of his game while working hard at what he wasn't doing so well in NJ while he was there. He is working extra hard to accomplish what NJ told him he has to do to be an NHL D-man.
Nemec on the other hand seems to play like he thinks he's got it all covered. I think he needs to mature. He has always been the man in his country, especially in international competition. He's not used to taking a back seat and he's not the man in the NHL by a long shot.
NJ has 2 very young outstanding NHL D-prospects in Casey and Nemec. Both will turn 21 in the 1st 2 months of 2025. If they can keep their heads on straight and bide their time, the NHL is in their future. Right now, Casey is playing that way. Nemec often does not.