Have the phone interactions after 3:41 been confirmed to be calls? Or were they just texts?
If texts, then technically both statements are correct: last call at 3:41 and last use at 6:00.
Also, if texts, then it's much more likely that one or both phones was being used by someone other than the owner. It's hard to fake somebody else's voice. It's easy to fake somebody else's text.
I do think it is something that only LE found as "activity" on her phone at the 6:00 AM time when LE had the records pulled. When TE called the phone company at first, he probably just got whatever they could easily provide. Then when LE pulled the entire phone records which would include tower signals being accessed, etc., there was some last "activity" that must have been flagged to the phone at 6:00 AM.
It could have been something like when you turn off your phone, maybe there is one last "ping" signal that goes out to a tower or something like that. So, it may have just been a last tower ping or something.
I like the theory about the 3:41 time may have been when she was abducted shortly after that time. And the 6 ish time is probably when it was close to being over. That is a good theory and it allows about 2 hours and 20 minutes for everything to be accomplished.
If we go with that, then unfortunately she could be futher away than what I would have hoped. But I am not outruling her being close by still because killing her , depositing her , and cleaning up as much as possible could easily take that long too even if she was placed close by.
For some reason, I just cant envision the perp(s) wanting to go too far away with all those easily accessible wooded areas so close by too. Areas that certain people would be very familiar with.