If your argument is that the judiciary can afford to be independent because the US will ignore them and just take anyone who they think is important to their in

If your argument is that the judiciary can afford to be independent because the US will ignore them and just take anyone who they think is important to their interests then yes, I can see that as a reasonable possibility. But it is also a reasonable possibility that the courts cave in. It depends what sort of pressure the US brings in to play. If you're arguing that the German judiciary had influence over the fate of Khaled El-Masri then I'm not sure how the argument is meant to hang together. They seem to have been powerless in that instance. The outcome depended on the CIA's judgement.