The investigation into these murders goes back years. Yes, LE was WAY behind the curve, what with the they went to Mexico theory, but there have been years of investigation into the various alternative theories of SODDI in this case. We are at trial now. The process, IMHO, is to prove BARD that CM is responsible for this crime, not that no other possibility exists. They already did that - that's why they arrested CM. Although LE made many mistakes early on, I do think SBSD did the best that they could. The process of investigation followed by most reasonably competent LE departments is to follow the evidence to a perpetrator, not the other way around. Through months and years of investigation, I believe they started with a huge funnel of possibilities and collected evidence that showed that Chase was likely their man. Did they eliminate other possibilities? I'd like to think so, and that they narrowed down a list of suspects and possibilities through investigation and elimination (i.e., was DK in Hawaii, no drug cartel would have had motive to kill this family, etc.). I think there is a lot of evidence, circumstantial and perhaps otherwise that we haven't heard yet that proves to me that CM is guilty beyond a reasonable doubt. The picture that the prosecutor is painting, and in fact, is almost always painted unless there is a direct witness (hardly ever happens IRL), is like a Monet. If I stand back far enough, I get a very clear picture of what it is and who is responsible. All the dots combine together to paint that picture. If I stand with my nose to the painting and try to examine one dot individually - it's just a blob of color, without context, almost meaningless in and of itself. I'll never figure it out or come to any conclusions if I get lost in the minutiae of each individual dot, and neither should the jury. At the end of the day, the juries' job is to step back and look at that picture, and say "Has the prosecution put enough blobs and dots on this canvas that when I step back, I can conclude that this is indeed, a painting of Chase Merritt?" And don't forget that they can apply the brushstrokes of common sense and logic.
I get the need to dissect the dots though... or to try to build a perfect picture from the pixels. We just want to understand and know why they did this and how exactly to the nth degree...but sadly, I don't think we ever will. I said this before and here I am, but I just don't have the patience for this slow-moving tediousness of a trial or going back to Square Zero when in my opinion, the Portrait of Charles Merritt as a Murderer is clear as day.