So let's say Naz doesn't forget his wallet, doesn't make the illegal left turn, and successfully skeedaddles back home.

At that point, all the cops would have to go on is Bodie's ID of the guy. He doesn't seem like a particularly reliable witness (Also, when the cops did take him in on the show, he didn't exactly do so willingly). So let's say he is able to give him some sort of ID, it's still looking for one "towel head" is a city of 9 million. There's no murder weapon (Naz has probably tossed it before the cops ever get close to finding him). The cab is cleaned up. Making an arrest would a whole shit ton tougher. Seems like a lot of stretches that Freddie would have to assume would go right just to get a smart square in jail to do his bidding. He'd be better off just waiting for someone to show up.