Hard to believe they wouldn't be able to establish a connection between he and Ricci. The grand jury surely could have called him in. Although maybe they did, I think back to the day Romero and some other ex-con walked to the Grand Jury some weeks after the others testified, wonder if that guy has a blue van.
The fact that Ed is offering a reward for information leading to this person is an indication that they don't know who it is yet.
The fact that Ed is offering a reward for information leading to this person is an indication that they haven't told Ed who it is if they know. Ed says there's a lot they 'can't' tell him.
Wonder if that's because LE doesn't want Ed to know that they know what HE already knows?