The point of this thread is to establish how Nutters such as yourself deal with this issue.
If you can't prove Givens lied, there is no issue to deal with.
Do you accept Givens' account of returning to the 6th floor as laid out in the WC report?
I have no reason not to. You certainly haven't provided one.
BTW, any evidence that makes it into the conclusions of the WC report can be considered 'key'. It's not a matter of whether or not YOU think it's key evidence.
Even if you could establish that Givens made up this story, which you haven't, it doesn't negate all the other evidence that positively establishes Oswald was the one who fired the shots from the sniper's nest. The WC scenario doesn't require that it be proven Oswald was on the 6th floor 35 minutes before the shooting because there is ample proof he was in the sniper's nest at the time of the shooting.
Do you guys ever bother to apply even a modicum of logic to your arguments.