If he thought that his farm was a safe enough place to hide a body where it would never be discovered, why bother burning it? It doesn't make sense.
If he thought that hiding a truck at his mother's house was good enough to keep it from being discovered, why did bother removing the seats? It is illogical.
I think the theory of 'if there was exculpatory evidence it would have been found by now' is a complete fallacy, the police haven't even managed to find the third person who was driving the Yukon, nor are they even sure now whether or not there was a third person, how does that prove that they have discovered everything of relevance so far? It gives me no confidence that they have uncovered everything that could have an impact on determining who the real killer is. In fact, it still leads me to question the competency of their entire investigation, honestly.
And since everyone likes to argue semantics here, in regards to your last paragraph, if they have committed the crime, they would not be considered to be sitting in jail in innocence. He has not even had his first bail hearing from what I recall, so doesn't that then put him into the category of those you consider to be sitting in silence in jail although innocent? And if he feels justified in waiting for his day in court to prove it, would he not also fall into that category as you described it?
Killers tend to kill, destroy evidence, dispose of evidence etc., based upon a few factors you aren't aware of.
Early in an investigation a broad approach is taken in many subject. The number of suspects in one example, until the evidence/investigation eliminates or adds to the number of suspects. Nothing to see there or read into.
If a murder is committed by "Joe Blow" and he is jailed, he can actually be "innocent" if the "contravention" or "murder" was justified. He would normally be getting out on bail, but perhaps he can't for whatever reason make bail(his deficit, not the Courts) and is awaiting trial.
There is a Judicial process you can educate yourself on....it starts with things like arrest, arraignment, RCC, bail hearing, preliminary and pretrial hearings, etc., etc. Justice follows a sequential path especially WRT right to release/bail, yet both still sit in jail. It appears their bail hearing has come and gone.
In my experience, very few suspects stay incarcerated until trial if truly innocent and uninvolved. The evidence, their statement, witnesses, etc. would shed light on a justifiable release on bail. So far we have seen no evidence of this and likely wouldn't see it with a publication ban in place.
However we do see them still incarcerated.
Once again, I'll say this about VIP/witness protection.....jail is a very poor place for witness protection if DM has acquired the wings and halo his fans are providing.
Evidence was collected, an affidavit was sworn, an arrest made, months and months have passed, we are at the Judicial Pretrial and both are still in jail.
That simply appears very very bad for the two of them as far as involvement.
Could they be innocent? Yes because after arrest and charges laid only a Jury can technically decide legal guilt or innocence at trial. However the Crown could drop charges if warranted by evidence to do so.
The real question currently is were they involved/did they do it? From the evidence so far and the way a judicial system works from arrest thru bail to pretrial/trial, I'd say yes, so far, so does the Hamilton Police Dept.