I noticed that too and for the last hour or so I've been wondering if they have something from, like Parabon, that doesn't resemble the sketch. If I remember correctly, the sketch is a composite from more than one witness who saw someone in the general area like the parking lot or on the trail that doesn't go to the bridge. The witnesses may be describing two different but similar persons. Or this person may be another witness, but not the killer. It's pretty much a given that the photo and audio are likely from the killer. But the sketch is of someone that was in another area related to the bridge.