I don't hold out much hope for the DNA found on glove on property in her neighborhood. Reason being, lots of gardeners, pool people, HVAC, light construction, etc have gloves and other debris fall out of the beds of pick up trucks all the time. But maybe it was a "fresh" glove and (hopefully) from the perpetrator.
A similar road I drive on you can see gloves and other trash occasionally. Would someone that took the time to hide their identity like they did be so stupid as to haphazardly throw one them out the window having done everything else pretty well? I doubt it... they would keep them on then throw them away (or keep it ) with their other stuff to later discard in a trash bin etc. That's just my take on it.
This case is perplexing in that there are some people on here that think the perpetrator was a buffoon for picking flowers and putting in front of the camera lens... but I don't think they realize that the guy has managed to keep himself from being identified with the best and brightest of investigators on the scene and using every forensic tool imaginable to find him. Sadly for Nancy, he was actually smart in several ways.
Having said that, I still believe there is no perfect crime.. Eventually, he (or they) will be identified and arrested at some point is my firm belief.