This schism isn't around Narci, it's around YOU. Imagine it. Arkham decides to kill Narci, because that's what he thinks is best. But in order to do that, he's going to have to kill you. Puzzle won't do anything. Arkham is more important to him than you are. But Swag will stand up for you, won't he? You know he will. And maybe Vex and Marilyn too. But we already know that Arkham doesn't draw the line at harming Family. What do you suppose he'll do to them, while trying to get to you?
No, that's...I mean, if he was going to do that, he's have done it by now. He's have done something by now.
He wouldn't hurt Swag, he's been there since the beginning...
*But so had YJ and he was even less threat than Swag. Vex and Mari were new, Arkham had no reason to value them...*
This is all speculative, I'm not that important, and Arkham is not a boogieman to throw at me!
*The doubt is obviously there though.*