Out on a tangent here so I'm not taking up for anyone.
There was talk earlier of Keepers and/or DE trolling Nicole. Take Keepers out of the equation. It's hard to since we already know she's tied to the case and spilled some beans. Could someone have been talking to Nicole pretending to be DE? Essentially both Nicole and DE would be trolled in this scenario. Someone could have established a Kik account ghosting as DE...complete with name and picture.
I don't think this theory plays into this exact case, but it's a far fetched idea that more than one people could have possibly been trolled. Of course LEO would have to trace the IP exactly to respective phones and computers. And thankfully things can be traced even if deleted.
I bring this up from personal experience. A disgruntled guy has cyber stalked me for years. He went on to establish fake FB, Twitter, classmates.com,etc. accounts with my name and picture. He was trolling me by pretending to be me.
I've known this to happen to a more than one person I know on the internet. Sorry to hear you were the target of such a thing
"Could someone have been stalking Nicole pretending to be DE?" Being that DE has at admitted to meeting her, it would seem that the person she was chatting with online is the same guy who met up with her. I considered that perhaps both DE and NK were trolling Nicole together from the same DE accounts. Maybe they sat at the PC/phone/tablet together, coming up with fake flattering, romantic things to say to Nicole, or took turns logging in from DE accounts to talk to Nicole. Maybe she told him what to type ... "tell her she's pretty".
It's entirely possible NK knew nothing about Nicole until DE pulled her into whatever evil scheme he had come up with.
Wish we knew more.