Everything this individual has done and seemingly has a track record for is both strategic and brazen. From assuring his ex is both financially covered to keep her mouth shut/to assuring she knows that if she talks the threat exists that she will pay for it, to falsifying records to make himself look like something he isn't, to using old photos to make himself look like something he isn't, to never staying in the same situation for very long, to scattered records, to knowledge of how to deal with very specific issues, to knowledge of setting up surveillance, and on an on. His entire track record reads like a person attempting to make himself look like an average Joe when but his job length/switching, connections and everything in between contradict that. So why the park?
We now know the cameras did not work at the park/were not active. Coincidence? I do not think so. He would not have picked that park unless he knew he could do so without identification via camera which is why I believe he told her, likely over the phone/not by text, that was their meeting spot to which she herself would have passed on to the driver and thus the drivers record would have indicated it came from her thus causing the police not know where the decision originated from and only knowing the last person she spoke to was him if indeed he doesn't even have a throw away phone which we do not know. Then she is disposed of in such a brazen way that the neighbors smelled the body parts and even asked him to which he said he will done soon. That is a very bold person and someone who has acted in such a way before in my opinion.
This is a man who has to control everything in his own home and has to see everything going on and has to have full control over it all. A sexual sadist who pushed himself into many groups which would have given him access to many young women both disenfranchised with life or looking to ascend their lives by meeting the right people. I think he cast a wide net over many different avenues. There is no way he didn't know that park was a deadzone or he wouldn't have picked it. He is in control with everything he does and strategic in everything he does despite being sloppy and leaving trails on a few instances. Overall though he left very few trails, very few and that, to me at least, speaks of a mind that knows the game he plays very well and is seasoned in it.