JL was 150-155lbs at the most. He wasnt a large man. He didn't have extreme musculature, or a mesomorph build. He appeared to be thin fit, and not very tall, maybe in the 5'7 -5'9 range.
Dead weight ( sorry for the term ) could have been manipulated pretty easily by a man of LM's stature, given the fact they are relatively the same size ( LM probably being slightly smaller, but not significantly ). Plus you have the adrenaline factor and no time constraints (i.e. he didn't need to rush, and there was no threat of him being caught ) also, LM's apartment was tiny, so he wouldn't have to move the body far. I think its all a moot point anyway, because it didnt appear to me he moved the body at all, rather he just let JL bleed out from the wound on his neck. At the 3:40 mark of the vid, there is a significant amount of blood on the bed which leads me to believe this.
You assume he only used a butchers knife to dismember the limbs, and head. but you dont actually see the cuts go all the way through, from top to bottom. The limbs/head are still attached, even though there are gaping wounds. Only when their is an obvious edit in the vid, are the limbs/head detached. He could have used a myriad of instruments to cut through the bone, none of which would be hard to obtain, and could easily be purchased at a hardware store ( I'm a hunter, and I use a 10$ hacksaw to cut the antlers off of Deer which are VERY dense, cutting through human bone wouldn't be an issue, and there are a variety of handsaws that could be used to do this). I assume he used something like this, and then simply edited it out.
You say he appeared devoid of feelings? I should say so, he just butchered an innocent human being in the most grotesque of ways. I dont suspect feelings are LM's strong suit. My contention is that all of the ghastly deeds LM committed were for shock value, and to "out do" if you will, the other kill vids that are available on the net, I contend that these acts weren't committed only to feed his abhorrent desires, but to stroke his ego as well. For all of his innumerable faults, LM was fairly internet savvy, and he knew what was out there. So I surmise when he concocted this nefarious plot, he wanted to combined all elements that are available on other vids ( necrophilia, cannibalism, dismemberment ) and then put them all in one macabre video, with him being the maestro,thus giving him a sense of worth ( albeit a demented one ).
People are giving this idiot too much credit, and thus making this incident into a conspiracy. LM didnt have friends, or close associations ( close enough to trust with a murderous plot anyway ) yet you're willing to believe there were 2 other people in the room with him who may have helped? If that were the case then a proven narcissist, all around evil fiend, who is infinitely self absorbed/obsessed would have committed the ultimate act of altruism by leaving a trail of bread crumbs leading too and incriminating himself, with the eventual outcome resulting in life imprisonment. And he did this to protect 2 other psychopaths which he must have had a great affinity for? Come on, thats just silly talk.
This committed this atrocity himself. It was his first and only time. All of his actions post the incident wreak of amateurism. He's not a bright or sophisticated individual, he's not a criminal mastermind. He's a sick man who failed in every aspect of life. So in order to attach worth to his miserable existence, he concocted a scheme in his twisted and perverted mind to kill someone and video it. He did nothing more than con a seemingly nice man over to his apartment, and murder him. That is all there is to this grand conspiracy.