And I was wrong about the word newcomer, fresh face differs a little bit. Now that I've read it along with the fact that Leonardo has been identified as leader I think they're most likely referring to him. Their description also corresponds with my theory that Leonardo oversees his family's interests while Stefano is in charge of the street operations. It's an interesting solution but I don't think it will last.
"It was between the brothers Kay -- I had nothing to do with it."