Unfortunately, several of Jesse Matthew's co-workers saw a resemblance between the sketch and Mathew, but chose to make jokes about it instead of calling in a tip. I wonder how many in this case see a resemblance between the sketch and the killer but choose not to call it in. "Oh, it couldn't be my co-worker. He is too nice."
Then Hannah Graham was murdered.
The sketch had been associated with Morgan Harrington and the unnamed rape victim for years, yet no one put a finger on Jesse Matthews until they saw video where he turned around on the street and followed Hannah. Then we saw his photo with his taxi. Only afterward was it possible to make a connection between Hannah, Morgan, and the unnamed rape victim.
If nursing staff thought that Matthews was the man who murdered Morgan Harrington and violently raped another woman, how could they make jokes? Did no one identify with #me too? Did they not realize what they knew? Paul Bernardo was an unlikely accountant and suspect, but someone called it in. Unfortunately, due to backlog, it was not analyzed for another year - more victims.
Back to the point, there must be someone who knows the suspect in the murders of two your girls on remote trails - someone who knows his voice when he's trying to sound scary.