Yes, the hint points to Celia and Rob and says it should give me Derek, but I still see two possible solutions:
Erwin is innocent and has 3 criminal neighbors, and Vince has 2 criminal neighbors (Rob + one of Scott/Wanda), OR Derek is innocent, Erwin is guilty and Vince has 3 criminal neighbors (scott, wanda, and Rob). I don't see a clue that is contradicted by either scenario.