I am not sure who is hiding anything. All I know is that Musharraf is no longer ruling. So maybe the case would have been better served if it was taken up after all of the necessary evidence was acquired through whatever means necessary. I am sure nobody is putting roadblocks in defence of Musharraf.
In your Amreeka, a jury is thrown out just on the basis of any indirect bias shown toward or against the parties. Here we have a bench full of judges who obviously have been helped by the party petitioning (NS) against a judgment in favor of a party (Musharraf) that ousted most of them.
I don't know about you, however had I been kicked out of work for whatever reasons without a salary and govt housing for a while, I would have had a few things on my mind about the person responsible. Hardly a composition for a balanced and fair judgment. Maybe our SC bench is comprised of individuals who demonstrate "aala zareefi" and can keep their personal biases and feelings in check, however knowing human nature, I suspect that to be the case greatly.