Baby Matt kidnapping abused children like some kind of pied Piper. He grows up in an army of kids he 'rescued' only to eventually realize that recruiting them to The Chaste might not have been the best idea.
The girl down the street could be the first one who doesn't want to come with him or the first one to point out that the idea is fucked.
You could play with when/why he went to law school, if he never did and met Foggy trying to figure out what he can legally do to rehome these kids, if there's a gang of little devils/Chaste roaming the streets. If Stick ever left and why. How Fisk and the gentrification of Hell's Kitchen fits in.
Really interesting stuff