Did you actually watch the documentary? The narrator clearly states that for the first time that this is Lukes story, and goes into reasons why he's never spoken out before, I'm sure that in phone conversation with Luke, Luke explains why he hasn't spoken out before!.
Documentaries are by nature design to pique publics interest and curiosity, not to provide information.
So you have no evidence to support your "hunch"! Having served jury duty several times, I hope to god you never do, as you cannot point to a single piece of evidence convincing you of someones guilt.
Now that most of the abuse has been removed from your post I can answer.
I did watch the documentary yes. It certainly piqued my interest and did an excellent propaganda job - both I and my partner were convinced a miscarriage of justice had been perpetrated by the time we finished watching. Most people watching won't (I would wager) bother to go that much more deeply into it and will assume Mitchell is innocent on the basis of watching this. That in itself is an injustice as far as I'm concerned. IMO, if the documentary makers were so certain that Mitchell was innocent they would have looked much more closely at the evidence against him and offered a plausible innocent explanation for it. As far as I recall Luke's brother was hardly mentioned at all for example, yet his evidence was apparently key.
I don't recall having a "hunch" about anything, nor did I realise I was sitting in a court of law when I wrote my last post, so why you feel the need to belittle my ability to serve on a jury heaven only knows.