I don't think TruthSeeker was saying it was about Tim being mad....I think TruthSeeker would recognize that he has a legitimate legal argument to run, and that their are good public policy reasons behind that argument.
But....what will the jury think?....will they think a part of the puzzle that may have helped Casey is missing? A good defence lawyer (and I'm not saying JB is one of those) can turn any lack of co-operation by authorities etc into an acquittal, no matter how strong the prosecution case. In fact, as a defence lawyer, the worst situation you can find yourself in, is before a Court with a prosecutor who comes across to the jury as bending over backwards to be fair and helpful to the defence. You might like the prosecutor because he makes your job easier and is a nice guy, but they give you little to work with if you don't have much of a defence. Jurors want to feel comfortable convicting people on serious charges, and if a prosecutor appears over zealous, it can really backfire.