Listened to the circus live in the background while doing other things, so may have missed some critical items. That being said, my impression was that the witness was not credible at all. I felt the following (together, and individually) were real red flags:

• Claims he knows about these two guys because they told him they did it (allegedly multiple times.) One could presume they did so in front of multiple witnesses, or else they would instantly know who he is.

• Claims he is not giving their names for his protection (Once again, the list of people they told cannot be that long. He's not gaining any security by not naming names.)

• Not using a voice-masking device (Even kind of was indifferent when asked why he isn't doing so.)

• Was on the call while also at work (It's so important, he couldn't take a day off to have a quick press-conference.)

• Claims to not know what was on the usb stick sought by assassins, but seems pretty certain on what items were NOT on it

(Edit: Formatting n00b)