Any right minded person, when pulled over and arrested by LE for a crime they did not commit or had nothing to do with, would initially tell LE that they are wrong, they were nowhere near the area in question that evening and can prove it with phone records, witness statements, video surveillance or whatever else you can think of to prove where you were other than in Ancaster that night. Most innocent people can come up with something to prove where they were and what they were doing.
I believe he was only interviewed for 12hrs. And I believe he refused to say anything. So basically LE spent 12hrs trying to wear him down? An innocent person would subject themselves to this? I doubt it.
If DM had been able to prove that they had the wrong person in custody, then all the speculation about him would never have been brought forward so yes he did have the ability to stop that. By being helpful and honest with investigators. No innocent person allows themselves to sit in jail for 2 years waiting for disclosure, which is what his lawyer has indicated he intends to do, when they could clear themselves within the first 24 hours. It just doesn't make sense to say that innocent people are so scared of saying something that LE will take the wrong way that they would rather go to trial to be deemed innocent by a jury of their peers then speak with LE and clear themselves right away.
IMO, DM is not revealing the name of the people he was with that night because he knows they will likely roll on him and indicate that the whole thing was his idea or that he was the one who actually killed TB. Considering all of the evidence was found in or on his own personal property, he does appear to be at least the person who came up with the idea of what to do after the fact. True or not, he has a better chance of reasonable doubt if LE do not find the other suspects. Hence the reason he refuses to name them.
When you are picked up by LE for a crime, it is not a court of law. While you do not have to "prove you are innocent" to them, it is in your best interest to do so. It is different than "proving you are innocent" in a court of law at trial. Something which we know you do no have to do, although if you can it certainly can't hurt your case. Your rights in the criminal justice system should not be a consideration when first picked up by LE for a crime you didn't commit. Your innocence and immediate freedom should be. If you can prove it and go home the same evening, you will.
MOO