Even if the police didn't fully investigate his alibi, the case would at best be that it's speculative that DK assisted CM with the murders. With zero evidence they conspired.
If CM and DK were charged together as co-conspirators, based on an IP address in San Diego and competing transactions in Hawaii including purchase of flights, and a photo of him there, and an ex-girlfriend who laid charges against him and detests him but also testifying he was in Hawaii with her, and no evidence of a conspiracy, the case against DK wouldn't have made it through the preliminary stages.
CM would not be off the hook with all the evidence he was at the crime scenes of the house, the Trooper and the graves.
No one has seen a shred of evidence DK did this and yet it is claimed based on sheer speculation of a motive, that this creates doubt over all the many strands of evidence against CM. Including physical DNA on the steering wheel in larger quantities than Joey's own wife, and not an iota of evidence they even met for lunch, let alone that he touched anything of Joey's on the 4th.
I need to pinch myself sometimes.
JMO
I agree (as you know!)
If DK were actually on trial - it would be laughed out of town due to his strong alibi. Not to mention there is no evidence against him for murder.
It's no surprise that following a "theory of the case" style of investigation, the DK angle went nowhere.
And this is of course a valid form of logic. One should expect to find evidence of innocence on the wrong theories and evidence of guilt on the right one.