So let me get this straight: they masterminded a hit by knowing when this even would take place and how everything would go down (how it would start, who would be there, etc.), and when to show up, but they let an incompetent (and possibly corrupt) DA’s office screw everything up?
OK, whatever.
You ever heard the phrase, “if incompetence can explain it, it was probably that rather than something sinister” (or similar)? I think it applies in this case. Now that the case is over (if it is) file a public information request. Since I’m a Texas attorney, I’d consider representing you. It will cost you, though. Probably a lot.
I can predict what a FOIA will accomplish. Nothing for 6 years and then you will get a summary of the wrist tapping a couple low level flunkies get. See Ludlow and Kent State Massacres.