Well, he didn't Lilo. He was very cautious approaching his front door and he had his gun ready.
Besides that one guy, Manny doesn't appear to have any people.
I too am disappointed in Jimmy. As I posted earlier, he doesn't seem to make things happen. He doesn't have that strategic aptitude like Nucky. However, I think he was right on the ball when he suggested that they settle with the black workers. Now that is something I can see Nucky suggesting.
But, the murder of his wife is going to have consequences. I can see him changing and even realigning with Nucky.