I looked up the earliest stories when SL was talking to the media, he said when he
https://beta.theglobeandmail.com/ne...een-dellen-millard-and-missing-woman/article1
I don't think DM would deliberately point to himself as the last person to be in contact with LB, however it's possible MS used her phone to call DM. I think they believed if they got rid of the phone, there wouldn't be any call history to track. I guess she didn't have an unlimited calling plan, like they probably did.
The issue about her apparently stopping posting on facebook, along with dropping off her dog and savings at home, and saying she was going on a trip, all point, to me, to DM telling her to do these things, so he could more easily make her disappear: he didn't want to deal with her dog, for eg. He might have isolated her for a while, just to guarantee no one was in close touch with her who would know where she was.
I worry about his statement to CD "First I'm going to hurt her".