Which would mean Libby was communicating with AS from the trail, since Kelsi had dropped them off 30-45 minutes earlier (hopefully someone know more accurately) and if Kelsi was the last to communicate with Libby, then why would they tell KAK that AS was the last one to communicate with Libby??
Remember that LE people are under no obligation to tell the truth to people they’re questioning. So, if for any reason they thought that telling him that was a better strategy, they were free to go for it.
MOO