What if PF lured KK to CO to be with him on Thanksgiving precisely to set up the alibi and the phone ping in Idaho?
They can't have been together much being 700 miles apart, so it wasn't a dating relationship. She's now a bit older, a bit heavier. Flattering male attention can made a women do very stupid things. ( A *cough,*friend told me this) Maybe he romanced her by phone to get her gullible enough to drive 14 hours to CO, arriving late on T-day, AFTER his plans for KB's murder and removal of her body. They spend the weekend together. He slips the phone into her bag and calls her (maybe on a burner phone?) to tell her somehow his ex's phone is missing & maybe ended up in KK's stuff.
I have to assume KK's home in Twin Falls is not in the tower range of the Gooding tower, but I don't know this. Somehow he gets her to dump the phone, maybe just "opening" it to make sure it's KB's which sets of the texts & the pings. Gooding is technically on the way to Moses Lake, WA (KB brother's residence) and Sandpoint, ID ( KB parent's residence). And Gooding should not be associated with PF at all.
From what LE alleges, PF has had more than 2 months to plan this murder, alibi, and destruction of evidence.
I think it's very possible KK's involvement was very intentional by PF and she did not realize what she had been involved with until Dec 15 when the missing person information was announced.
If she went straight to LE then, she would not be in the position to be arrested and she may actually be under LE protection, with "administrative leave" from her work.
And, it also leaves me thinking there is still someone else out there involved in this.