Are you kidding me?
You and gagal know tons more about this than I do.
But concerning the phone call, I am thinking a couple of things.
One, although I rarely use it, many phones have a redial button, often well marked, although if it isn't it might point to someone who knows the phone well, like maybe it's his own.
I suspect that the person who called at 10:44 pm only hit the redial button, and on purpose. I think that it would be an attempt to show an intruder there who "accidentally" hit the redial button, giving his presence away via caller id.
I am assuming that whether Theresa's sister had noticed or not, that the call, at least this call, the last call from Theresa's house, would be available to investigators, and thus shows suspicious activity in her house at a critical moment, that being just about when she would be returning home from working on her new apartment.
Given it was at that time, there is also the possibility that it was intended to look like Theresa came in the door and was accosted by an intruder, where she was only able to make it to the phone, knock off the receiver, and perhaps redial was supposed to be an accident. She certainly would have dialed 911 if she could dial.
This is also all within context of a very important call, that being the person Theresa was talking to on her cellphone at 10:15 pm, where she was seen by a neighbor talking on her cellphone outside of her new apartment. It is the 10:15 pm to 10:44 pm time frame for which is about the time frame to drive home.
Investigators have stated they know who she was talking to on that last call, but haven't stated who.
It is my assumption that it was the ex. I suspect that he called from his cellphone for some reason as a setup, and indicated to Theresa something which would have placed him well away from her house. It's my feeling that he expected her to call her sister with some info that when that call came from Theresa's house, the ex would not have been suspected of being there.
Theresa left, presumably straight for home, but did not call her sister after that.
I feel the call was made from her house to simulate an attack that hadn't taken place yet, but would shortly.
rd