Sorry for the long post, but I really can't find MS saying that they moved the body inside of the incinerator. Here are the relevant twits from p. 39 of this thread. Is it the "huffed and puffed" part that DM did it himself? I'm surprised that it was not clarified. Can anybody confirm or direct?
Read them and put 2 and 2 together.
It wasn't actually stated he did, just went from opening the lid to ... I believe we assume he did it himself. IMO
MS doesn't want to admit to touching the body because that is a crime in itself. IMO