Condescension aside, in my opinion your explanation is only half logical, in that you seem to be saying that getting rid of half of the evidence halfway (meaning destroy the external evidence on the body but leave it on your property and hide the truck but only in a trailer on another property that would quickly be linked to you) would have made them feel wholly secure in remaining free, enough not to have tried that extra little bit and gone the whole way and just move the body to an remote area not connected to you, and burn the truck or sink it in the bottom of a lake, again, not on a property easily linked to you. Or how about this, not a common idea to most of us, but as I believe you said before, criminals tend to use the tools at hand, so why not use the incinerator to reduce the body to ash and small crushable bone fragments, and then use one of the personal aircraft that you could certainly solo in to dump the remains in a way that they could never be recovered? Wouldn't a nice airplane ride be preferable to spending years wondering if that knock will ever come on the door to ask you about a body found on your property? Hiding evidence still does not eliminate witnesses or their damning testimony.
Nothing that was done to TB's person or property after the fact could alter SB's eyewitness testimony, whether it is accurate or not, and I don't really think that is even an opinion, that is just logic. Her eyewitness account could have been taken immediately, before the killer had even decided what to do with the body, that doesn't change her statement or it's impact later. Each piece of evidence must be taken on its own merit and should be able to stand without the aid of other evidence that without which it would be found unsupportable or unsubstantiated, from what I know. So her eyewitness testimony must stand on its own merit, regardless of what the other evidence suggests, even if she picked out completely different people or was unable to make an identification. If 5 pieces of evidence point towards A but 2 pieces point towards B, does that automatically discount the validity of the 2 pieces, or of the 5 pieces, or of both? It is up to each juror to weigh the evidence as a whole.
And back to the dismemberment comment, I believe you were earlier saying something about punks being able to jump a man from behind but not having the guts to dismember the body, and someone pointed out that DM has no butchering skills that we know of, maybe you are suggesting the body was not dismembered? After all, the state of the remains found is still a matter of speculation.
If people who have jobs that desensitize them to blood and violence are more at risk to themselves commit violent crimes, than statistics should show that morticians, boxers, paramedics and police officers would all have higher murder rates than the average, would they not?
Being charged buy the police is not a fact that can be used against you in a trial, and it is possible that the officers who swore out the affidavit did so prematurely, before all the evidence was collected. If it turns out during the course of the investigation that some of the evidence isn't matching, it is up to the police whether or not they want to continue investigating that particular avenue of the investigation or if they want to ignore it and continue where they feel it easier to prove guilt. And I don't want to nitpick here, but the police have been known to swear out affidavits on people who turn out to be innocent, in reality.