I've been turning something over and over in my head and I'm going to put it out there. Maybe this is impossible, or too overwhelming for LE to check out, but if it could be done...
At two critical time periods, visits to well-frequented locations occurred and I have copied over those two timeline entries here from those provided by Gardener1850 on page 1 of the thread:
8 Sept 2019 – Tylee is seen for the last time last on a trip to Yellowstone with Lori, JJ and Alex. Police obtained phone records that show Lori, AC and J.J. went to Yellowstone National Park. There is also a photo of Tylee at the park entrance from Lori’s iCloud account. “This is the last time we can find any record of [Tylee Ryan] being with Lori Vallow. We have found no witnesses who can verify they have seen TR since Sept. 8, 2019,” (Affidavit of Probable Cause Doc; East Idaho News).
Approx 28 Nov - Dec 1, 2019 – Chad spends Thanksgiving weekend on vacation with his family in Southern California, traveling there via SLC airport. Photos posted to social media show Chad at the airport and later Knott’s Berry Farm, an amusement park in Buena Park, CA. Lori wasn't in any of the photos and her location during this time is unconfirmed. The CA trip was concluded Dec 1 and photos were posted on social media Dec 2 (WS Verified Insider posts).
In the approx. 7-week period BETWEEN the two trips (primarily within a month after the first), JJ disappears, TD is shot at in her driveway, CD urges TD to take a trip to see her family, BB is shot at as he pulls into his driveway, Melani moves to Rexburg (after attempting to track down BB and her children), TD dies "peacefully in her sleep," CD moves out of the home he shared with TD and his children, and Lori and CD marry on a beach in Kauai.
Immediately BEFORE the second trip, LE attempted the wellness check on JJ and was lied to by Lori, CD, and AxC, who all left town the next day. At the same time as the second trip, in nearby Vegas (4 hrs driving time away), AxC and ZP marry (and he takes her name) and then MBP and IP marry (and AxC serves as witness, using his new last name).
Lori's presence is unknown during the timing of that second trip, but it is known she had vacated Rexburg and that immediately AFTER that second trip, she and CD fly to Kauai.
Is it possible that the well-frequented locales are chosen for both these visits because, given there are so many people and their cellphones present in those locations at any given time (and especially during or around holidays), LE's ability to narrow down upon and identify cellphone users who are in close proximity to the cellphones of known key figures BOTH dates is thwarted?
What are the odds that someone will be vacationing in YNP the weekend after Labor Day and will also be vacationing at Knott's Berry Farm around Thanksgiving?
It seems worth considering.
(IIRC, there was a flyer promoting a meeting near YNP the weekend after Labor Day of one of the groups that associated with CD and LVD as podcasters/speakers. So, there may be many known associates of CD/LVD in that area at the time. But, KBF at Thanksgiving too?)