I agree with pretty much everything you said. Here's the thing: in the jaren case, the camera was super clear and the people were easily identifiable. I didn't say they saw everything in these Mickey frames. The big "if" here depends on those LCG cameras being live feed or like the traffic cameras. Those have HUGE lapses of time, when we're talking about a possible three second accident. Anyway, I'm a professional photographer and after really looking at shadows, contrast, light, etc in photoshop, it is more than obvious that there are areas of the photo that have been blocked out with different layers. We can only speculate why and what is under these layers. So, what we see may very well be what they see, except, of course, the parts of the picture that have obviously been blocked out. And if I was the defendant, I'd feel pretty good about my trial outcome if the evidence was that picture and another of the scene 15 seconds later. You can't be serious that you believe that would be enough evidence. They are not looking to arrest the driver of the truck. They are looking to find Mickey. So, if you have the driver of the truck in jail, do you really believe, with all of your investigative experience, that the driver would talk and they'd find Mickey? I don't.
They know who did it. They don't, however, know where Mickey is.
It's why the adds on tv say "if you know anything about Mickey, or this truck, please call." I don't get the feeling they're interested in much else. Somebody may have seen Mickey and I dare say the person that drives the truck has some friends around here somewhere.
I am hesitant to say this, because I will not confirm my source, but an acquaintance of the driver has talked... Searches are going on. I'll say this. There are murky water sonar searches going on and they're not at whiskey bay.
All of this is my own opinion, of course.
(so, since you're obviously not working on the case, what exactly would you arrest someone for with this "hard evidence"? let's not forget, Jaren's body was found)