Its possbile he did, but usually they move considerable distances, away, they sometimes return to the areas they know but in many cases, what happens is , that they commit a crime, they get caught, from there they serve time, are under some form of supervision, or are aquitted, so either the people around them dont want them around, especially if what they did was "icky" or they figure, theythemselves want to get away from the scrutiny they are going to face so they leave. In the "old days" if you caught someone doing something sexual in nature, they sent them "somewhere" could be to live with grandparents, could be a cousin etc..
However, since, what were dealing with is pathological its not long before theyre back at it , then the process repeats itself. Especially once they fall into similar situations which they almost always do, then the scene is ripe for re-offending.
Unfortunately its impossible to render a true Psycholigical profile without certain items so again this is all speculative, but we can give a general profile of a few types that do these things.
In terms of the sketches, I think LE is doing its best, the video is really bad, its taken from a distance, that looks like it was zoomed in on an device, without the best camera. Its hard to do , you cant tell if he has on a hat , or is that his hair? , thats why they are saying its "somewhere in between" the 2
Though that is certainly a suspect, that needs to be questioned, you cant lose sight of the fact that the individual in the video may have absolutely nothing to do with their murder, but until we find him, talk to him and eliminate him "he" is the best link we have.. I beleive he does. It was just too coincidental.
I beleive were dealing with a lone offender, im not certain how he initially made contact with the victims, whether or not he was just out and came upon them, or if he saw them being dropped off, or if he knew they were going that day, or was following Libbys social media and decided to go for a walk once he saw 2 girls all alone.
But Im sure that it was sexually motivated, that the individual in question has a criminal history that most lilely involves, to some degree, sexual offenses, possily with young girls, I feel pretty confident something set him off in the days or weeks prior. Im thinking possibly a loss of employment, or an argument but again that could be wrong I dont have info to guide me there.
However, one thing not to ignore is theres a reason that individual is there on the same day off the girls are off from school, he may work at a school, he may work at their school , he may work nights, he may be out of work, but suddenly appearing at 2:30 on a thursday afternoon in the area where 2 girls are all alnoe and commit double murder seems a little bit too coincidental .
The use of the term "guys" in and of itself seems pretty intersting, that seems to indicate atleast a general familiarity with kids, thats a general term you see coaches, teachers, etc.. use. that leans me more toward the use of a ruse. if it were more demanding "go down the hill !" i think were dealing with a forced, move.
The individual would need to account for his time that day in most cases, unless he didnt have to because he wasnt working, but SOMEONE knows he was out during that time, and again, I think SOMEONE probably suspects him, but just hasnt come forward or hasnt put 2 and 2 together.
His presence obviously botherd the girls hence the video and audio, but not enough for them to flee, but without knowing what the girls would've done when approached by a stranger, its speculation at best.