I guess the perceived condescending attitude drove him off.
Lucius Cypher said
For now they just play as background characters who gives Dominick day jobs and a source of not-illegal income. They actually won't come into play until Dark Matter messes up, however that happens. Either he gets defeated and thrown into prison or get his secret identity figure out, whatever happens first. Additionally they were made for people like Titan, who are made to be villains but needs a source to gain their powers or at least someone to give them something to do aside from aimless robberies and attacks. But you took care of that yourself using Bane.