OK - based on things that LE has already said....
Perhaps LE found tracks of the perp either leading into or out of the park through the woods where Jenise was found which is why there were a few LE cars parked down below by HWY 303.
To get down there, the path would travel through heavy brush, across a creek and then through more bushes and trees until you come out at the open area down by the highway.
If someone tracked IN that way, there would probably be mud within the park somewhere. If they left through the woods and didn't have a car to get away in, maybe they were spotted on the main road by a passing driver.
If the perp used the woods as either and entrance or exit or both, they are sure to have some scratches from the bushes on their arms, probably their face too.