In the most recent ISP photo dump, there is a crime scene photo (113) with one doc marten boot in the living room, kind of in the middle of the room. In the same photo dump, photo 111 shows that boot's mate on it's side on the floor right next to the left end of the couch:
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I don't any other shoes in the living room, and no shoes at all on the 3rd floor stairs or the hall to xana's room.
IMHO, the problem with the idea of Xana having put on boots/shoes to go get her food, and that was what made the clompy shoe noise on the stairs that DM thought she heard.....is that Xana was found without any pants on. She was wearing a sweatshirt and thong undies and that is all.
Even with boots on, Xana's not going outside via the backdoor and around to the front to grab her food wearing a sweatshirt and thong underwear on a cold Nov night in Idaho.
Sure, there is a small chance she had on very baggie sweatpants, slid into some docs to go outside to get food.....but in order to be found as she was (wearing just the sweatshirt and thong undies), we'd have to believe something like this happened:
--grab food from outside, walk back around to patio door go back to her room
--slip off her sweatpants, and leave the boots on....
--leave her room and then go up the 3rd floor steps to see what is going on
--immediately be chased down the stairs
--kicks off both her boots in the living room while running
--attacked and murdered
--found in room wearing just the sweatshirt and thong undies
And I don't see her taking off sweats/bottoms in her room after removing boots...deciding to leave her room to go to kitchen or up to the 3rd floor and putting on boots just to do that.
I think the likeliest and simplest solution is that what DM thought was boots was either BK (heavier body, doesn't matter what shoes he was wearing), or the sounds of Xana and BK running down the stairs and past her room, IMHO.