I mean this respectfully - I think you guys are looking too deeply into the word choice. I believe AB's lawyer simply means that he was betrayed. He let this person close to him have access to the room and they chose to betray AB (allegedly). I think it's very much worth considering the possibility that the leaker didn't spontaneously do this without direction, as I'm sure many of you are.
I think we have to keep an open mind about whether AB was betrayed. As I understand, there's an ongoing investigation into how the evidence was taken and released to the public. We should wait until we learn the results of that investigation. ISP is hopefully taking advantage of the tools available to them to track cell phone, internet, text and other activity related to the documents and those who had them.