One of the aspects of both were their disagreement with the Bush administration concerning current policy...
That's obviously why he chose them. And of course I highly doubt he actually knows them or has even had any contact with them. But that makes them non-independent for the other reason. "Independent" means they have to be acceptable to both sides of the issue. He choses witnesses he thinks will be favorable to his side because they're also activists. As my lawyer associates keep reminding me, "You get a jury of your peers, not a jury of your friends."
...but as many have posted even if the test were done and if his witnesses were present, the test would not have been enough. The purpose was to present that government has lied therefore other activities of the government are drawn into question.
Yes, as we've belabored. There can be more than one thing wrong with an argument. Proving that one government agency lied 50 years ago about one thing doesn't prove a different government agency lied ten years ago about a separate thing. It's just a distraction: "I can't get any traction for my 9/11 claims or my other crackpottery, so I'm going to shift focus to something I think is easier to argue." That's because it's ego reinforcement. It always grasps at low-hanging fruit.
Simultaneously, staging a test for witnesses, in the manner of previously conducted tests, is not the least probative when all other evidence is set aside for reasons that would doom the requested test as well. Again, it's distraction. There always has to be one more "reasonable" step that hasn't been taken, so that the proponent can continue to assert the question remains ambiguous.
And by the way, I doubt we'll see any more of Baker. While he can certainly continue to post on-topic statements, the moderation effectively prevents him from talking about what he really wants to talk about. And it's not as if he was secretive about his true disinterest in the forum topic.